【黑马Android】(05)短信/查询和添加/内容观察者使用/子线程网络图片查看器和Handler消息处理器/html查看器/使用HttpURLConnection采用Post方式请求数据/开源项目
备份短信和添加短信操作系统短信的uri: content://sms/<manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.itheima28.backupsms"android:versionCode="1"android:versionName
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备份短信和添加短信
操作系统短信的uri: content://sms/
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.itheima28.backupsms"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_SMS"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.itheima28.backupsms.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:onClick="backupSms"
android:text="备份短信" />
</RelativeLayout>
package com.itheima28.backupsms.entities;
public class SmsInfo {
private int id;
private String address;
private long date;
private int type;
private String body;
public SmsInfo(int id, String address, long date, int type, String body) {
super();
this.id = id;
this.address = address;
this.date = date;
this.type = type;
this.body = body;
}
@Override
public String toString() {
return "SmsInfo [id=" + id + ", address=" + address + ", date=" + date
+ ", type=" + type + ", body=" + body + "]";
}
public SmsInfo() {
super();
// TODO Auto-generated constructor stub
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public long getDate() {
return date;
}
public void setDate(long date) {
this.date = date;
}
public int getType() {
return type;
}
public void setType(int type) {
this.type = type;
}
public String getBody() {
return body;
}
public void setBody(String body) {
this.body = body;
}
}
package com.itheima28.backupsms;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.xmlpull.v1.XmlSerializer;
import com.itheima28.backupsms.entities.SmsInfo;
import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.content.ContentResolver;
import android.database.Cursor;
import android.util.Xml;
import android.view.Menu;
import android.view.View;
import android.widget.Toast;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
/**
* 备份短信
* @param v
*/
public void backupSms(View v) {
// 1. 查出所有的短信
Uri uri = Uri.parse("content://sms/");
ContentResolver resolver = getContentResolver();
Cursor cursor = resolver.query(uri, new String[]{"_id", "address", "date", "type", "body"}, null, null, null);
if(cursor != null && cursor.getCount() > 0) {
List<SmsInfo> smsList = new ArrayList<SmsInfo>();
SmsInfo sms;
while(cursor.moveToNext()) { // 控制游标结果集的指针向下移一位, 当到最后一位, 停止.返回false
sms = new SmsInfo();
sms.setId(cursor.getInt(0)); // 设置短信的id
sms.setAddress(cursor.getString(1)); // 设置短信的号码
sms.setDate(cursor.getLong(2)); // 设置短信的日期
sms.setType(cursor.getInt(3)); // 设置短信的类型, 接收1还是发送2
sms.setBody(cursor.getString(4)); // 设置短信的内容
smsList.add(sms);
}
cursor.close();
// 2. 序列化到本地
writeToLocal(smsList);
}
}
/**
* 序列化到本地
*/
private void writeToLocal(List<SmsInfo> smsList) {
try {
XmlSerializer serializer = Xml.newSerializer(); // 得到序列化对象
// 指定输出位置
FileOutputStream fos = new FileOutputStream("/mnt/sdcard/sms.xml");
serializer.setOutput(fos, "utf-8");
serializer.startDocument("utf-8", true);
serializer.startTag(null, "smss");
for (SmsInfo smsInfo : smsList) {
serializer.startTag(null, "sms");
serializer.attribute(null, "id", String.valueOf(smsInfo.getId()));
// 写号码
serializer.startTag(null, "address");
serializer.text(smsInfo.getAddress());
serializer.endTag(null, "address");
// 写时间
serializer.startTag(null, "date");
serializer.text(String.valueOf(smsInfo.getDate()));
serializer.endTag(null, "date");
//写类型
serializer.startTag(null, "type");
serializer.text(String.valueOf(smsInfo.getType()));
serializer.endTag(null, "type");
// 写内容
serializer.startTag(null, "body");
serializer.text(smsInfo.getBody());
serializer.endTag(null, "body");
serializer.endTag(null, "sms");
}
serializer.endTag(null, "smss");
serializer.endDocument();
Toast.makeText(this, "备份成功", 0).show();
} catch (Exception e) {
Toast.makeText(this, "备份失败", 0).show();
e.printStackTrace();
}
}
}
相亲神器
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.itheima28.xiangqin"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.WRITE_SMS"/>
<uses-permission android:name="android.permission.READ_SMS"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.itheima28.xiangqin.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
package com.itheima28.xiangqin;
import android.net.Uri;
import android.os.Bundle;
import android.os.SystemClock;
import android.app.Activity;
import android.content.ContentValues;
import android.view.Menu;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 停10秒钟, 想系统短信数据库中写一条短信
new Thread(new Runnable() {
@Override
public void run() {
SystemClock.sleep(10 * 1000);
Uri uri = Uri.parse("content://sms/"); // 操作sms表的uri
ContentValues values = new ContentValues();
values.put("address", "95555");
values.put("type", "1");
values.put("body", "您的尾号为8890的账户, 收到100, 000, 000, 000.00元的转账. 活期余额为: 899, 777, 000, 111, 000.00元");
getContentResolver().insert(uri, values);
}
}).start();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
查询和添加联系人
查询联系人:raw_contacts, data
查询:
1. 去raw_contacts表中取所有联系人的_id
2. 去data表中根据上面取到的_id查询对应id的数据.
content://com.android.contacts/raw_contacts
content://com.android.contacts/data
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity" >
<Button
android:onClick="queryContacts"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="查询所有联系人" />
<Button
android:onClick="addContacts"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="添加联系人" />
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.itheima28.contacts"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.READ_CONTACTS"/>
<uses-permission android:name="android.permission.WRITE_CONTACTS"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.itheima28.contacts.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
package com.itheima28.contacts;
import android.app.Activity;
import android.content.ContentValues;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
public class MainActivity extends Activity {
private static final String TAG = "MainActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
private void printCursor(Cursor cursor) {
if(cursor != null && cursor.getCount() > 0) {
while(cursor.moveToNext()) {
int columnCount = cursor.getColumnCount(); // 列的总数
for (int i = 0; i < columnCount; i++) {
String columnName = cursor.getColumnName(i); // 取对应i位置的列的名称
String columnValue = cursor.getString(i); // 取出对应i位置的列的值
Log.i(TAG, "当前是第" + cursor.getPosition() + "行: " + columnName + " = " + columnValue);
}
}
cursor.close();
}
}
/**
* 查询联系人
* @param v
*/
public void queryContacts(View v) {
// 1. 去raw_contacts表中取所有联系人的_id
Uri uri = Uri.parse("content://com.android.contacts/raw_contacts");
Uri dataUri = Uri.parse("content://com.android.contacts/data");
Cursor cursor = getContentResolver().query(uri, new String[]{"_id"}, null, null, null);
// printCursor(cursor);
if(cursor != null && cursor.getCount() > 0) {
while(cursor.moveToNext()) {
int id = cursor.getInt(0);
// 2. 去data表中根据上面取到的_id查询对应id的数据.
String selection = "raw_contact_id = ?";
String[] selectionArgs = {String.valueOf(id)};
Cursor c = getContentResolver().query(dataUri, new String[]{"data1", "mimetype"},
selection, selectionArgs, null);
if(c != null && c.getCount() > 0) {
while(c.moveToNext()) {
String mimetype = c.getString(1); // 当前取的是mimetype的值
String data1 = c.getString(0); // 当前取的是data1数据
if("vnd.android.cursor.item/phone_v2".equals(mimetype)) {
Log.i(TAG, "号码: " + data1);
} else if("vnd.android.cursor.item/name".equals(mimetype)) {
Log.i(TAG, "姓名: " + data1);
} else if("vnd.android.cursor.item/email_v2".equals(mimetype)) {
Log.i(TAG, "邮箱: " + data1);
}
}
c.close();
}
}
cursor.close();
}
}
public void addContacts(View v) {
Uri uri = Uri.parse("content://com.android.contacts/raw_contacts");
Uri dataUri = Uri.parse("content://com.android.contacts/data");
// 1. 在raw_contacts表中添加一个记录
// 取raw_contacts表中contact_id的值
Cursor cursor = getContentResolver().query(uri, new String[]{"contact_id"}, null, null, "contact_id desc limit 1");
if(cursor != null && cursor.moveToFirst()) {
int contact_id = cursor.getInt(0);
contact_id ++;
cursor.close();
ContentValues values = new ContentValues();
values.put("contact_id", contact_id);
getContentResolver().insert(uri, values);
// 2. 根据上面添加记录的id, 取data表中添加三条数据
// 存号码
values = new ContentValues();
values.put("mimetype", "vnd.android.cursor.item/phone_v2");
values.put("data1", "10086");
values.put("raw_contact_id", contact_id);
getContentResolver().insert(dataUri, values);
// 存姓名
values = new ContentValues();
values.put("mimetype", "vnd.android.cursor.item/name");
values.put("data1", "中国移动");
values.put("raw_contact_id", contact_id);
getContentResolver().insert(dataUri, values);
// 存邮箱
values = new ContentValues();
values.put("mimetype", "vnd.android.cursor.item/email_v2");
values.put("data1", "10086@kengni.com");
values.put("raw_contact_id", contact_id);
getContentResolver().insert(dataUri, values);
}
}
}
内容观察者使用
内容观察者:
发件箱的uri:content://sms/outbox
package com.itheima28.contentobserverdemo;
import android.app.Activity;
import android.content.ContentResolver;
import android.database.ContentObserver;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 监听系统短信
ContentResolver resolver = getContentResolver();
// 注册一个内容观察者观察短信数据库
resolver.registerContentObserver(Uri.parse("content://sms/"), true, new MyContentObserver(new Handler()));
}
/**
* @author andong
* 内容观察者
*/
class MyContentObserver extends ContentObserver {
private static final String TAG = "MyContentObserver";
public MyContentObserver(Handler handler) {
super(handler);
}
/**
* 当被监听的内容发生改变时回调
*/
@Override
public void onChange(boolean selfChange) {
Log.i(TAG, "短信改变了");
Uri uri = Uri.parse("content://sms/outbox"); // 发件箱的uri
// 查询发件箱的内容
Cursor cursor = getContentResolver().query(uri, new String[]{"address", "date", "body"}, null, null, null);
if(cursor != null && cursor.getCount() > 0) {
String address;
long date;
String body;
while(cursor.moveToNext()) {
address = cursor.getString(0);
date = cursor.getLong(1);
body = cursor.getString(2);
Log.i(TAG, "号码: " + address + ", 日期: " + date + ", 内容: " + body);
}
cursor.close();
}
}
}
}
网络图片查看器
Android notResponding(应用程序无响应) 阻塞了主线程 ANR异常
异常:
CalledFromWrongThreadException: Only theoriginal thread that created a view hierarchy can touch its views.
只有原始的线程(主线程, ui线程)才能修改view对象.
在子线程中修改view的显示状态, 会报上面异常.
子线程网络图片查看器和Handler消息处理器
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.itheima28.netphoto"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<!-- 访问网络的权限 -->
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.itheima28.netphoto.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity" >
<ImageView
android:id="@+id/iv_icon"
android:layout_width="fill_parent"
android:layout_height="0dip"
android:layout_weight="1" />
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<EditText
android:id="@+id/et_url"
android:layout_width="0dip"
android:text="http://imgstatic.baidu.com/img/image/d833c895d143ad4bf450b6dd80025aafa40f06b4_%E5%89%AF%E6%9C%AC.jpg"
android:layout_height="wrap_content"
android:singleLine="true"
android:layout_weight="1" />
<Button
android:id="@+id/btn_submit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Go"
android:textSize="20sp" />
</LinearLayout>
</LinearLayout>
package com.itheima28.netphoto;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import javax.net.ssl.HttpsURLConnection;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;
public class MainActivity extends Activity implements OnClickListener {
private static final String TAG = "MainActivity";
protected static final int ERROR = 1;
private EditText etUrl;
private ImageView ivIcon;
private final int SUCCESS = 0;
private Handler handler = new Handler() {
/**
* 接收消息
*/
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
Log.i(TAG, "what = " + msg.what);
if(msg.what == SUCCESS) { // 当前是访问网络, 去显示图片
ivIcon.setImageBitmap((Bitmap) msg.obj); // 设置imageView显示的图片
} else if(msg.what == ERROR) {
Toast.makeText(MainActivity.this, "抓去失败", 0).show();
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ivIcon = (ImageView) findViewById(R.id.iv_icon);
etUrl = (EditText) findViewById(R.id.et_url);
findViewById(R.id.btn_submit).setOnClickListener(this);
}
@Override
public void onClick(View v) {
final String url = etUrl.getText().toString();
new Thread(new Runnable() {
@Override
public void run() {
Bitmap bitmap = getImageFromNet(url);
// ivIcon.setImageBitmap(bitmap); // 设置imageView显示的图片
if(bitmap != null) {
Message msg = new Message();
msg.what = SUCCESS;
msg.obj = bitmap;
handler.sendMessage(msg);
} else {
Message msg = new Message();
msg.what = ERROR;
handler.sendMessage(msg);
}
}}).start();
}
/**
* 根据url连接取网络抓去图片返回
* @param url
* @return url对应的图片
*/
private Bitmap getImageFromNet(String url) {
HttpURLConnection conn = null;
try {
URL mURL = new URL(url); // 创建一个url对象
// 得到http的连接对象
conn = (HttpURLConnection) mURL.openConnection();
conn.setRequestMethod("GET"); // 设置请求方法为Get
conn.setConnectTimeout(10000); // 设置连接服务器的超时时间, 如果超过10秒钟, 没有连接成功, 会抛异常
conn.setReadTimeout(5000); // 设置读取数据时超时时间, 如果超过5秒, 抛异常
conn.connect(); // 开始链接
int responseCode = conn.getResponseCode(); // 得到服务器的响应码
if(responseCode == 200) {
// 访问成功
InputStream is = conn.getInputStream(); // 获得服务器返回的流数据
Bitmap bitmap = BitmapFactory.decodeStream(is); // 根据 流数据 创建一个bitmap位图对象
return bitmap;
} else {
Log.i(TAG, "访问失败: responseCode = " + responseCode);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if(conn != null) {
conn.disconnect(); // 断开连接
}
}
return null;
}
}
html查看器
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.itheima28.htmldemo"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.itheima28.htmldemo.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<EditText
android:id="@+id/et_url"
android:layout_width="0dip"
android:text="http://www.baidu.com"
android:layout_height="wrap_content"
android:singleLine="true"
android:layout_weight="1" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="getHtml"
android:text="GO" />
</LinearLayout>
<ScrollView
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<TextView
android:id="@+id/tv_html"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
</ScrollView>
</LinearLayout>
package com.itheima28.htmldemo;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
private static final String TAG = "MainActivity";
private static final int SUCCESS = 0;
protected static final int ERROR = 1;
private EditText etUrl;
private TextView tvHtml;
private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case SUCCESS:
tvHtml.setText((String) msg.obj);
break;
case ERROR:
Toast.makeText(MainActivity.this, "访问失败", 0).show();
break;
default:
break;
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
etUrl = (EditText) findViewById(R.id.et_url);
tvHtml = (TextView) findViewById(R.id.tv_html);
}
public void getHtml(View v) {
final String url = etUrl.getText().toString();
new Thread(new Runnable() {
@Override
public void run() {
// 请求网络
String html = getHtmlFromInternet(url);
if(!TextUtils.isEmpty(html)) {
// 更新textview的显示了
Message msg = new Message();
msg.what = SUCCESS;
msg.obj = html;
handler.sendMessage(msg);
} else {
Message msg = new Message();
msg.what = ERROR;
handler.sendMessage(msg);
}
}
}).start();
}
/**
* 根据给定的url访问网络, 抓去html代码
* @param url
* @return
*/
protected String getHtmlFromInternet(String url) {
try {
URL mURL = new URL(url);
HttpURLConnection conn = (HttpURLConnection) mURL.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(10000);
conn.setReadTimeout(5000);
// conn.connect();
int responseCode = conn.getResponseCode();
if(responseCode == 200) {
InputStream is = conn.getInputStream();
String html = getStringFromInputStream(is);
return html;
} else {
Log.i(TAG, "访问失败: " + responseCode);
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 根据流返回一个字符串信息
* @param is
* @return
* @throws IOException
*/
private String getStringFromInputStream(InputStream is) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = -1;
while((len = is.read(buffer)) != -1) {
baos.write(buffer, 0, len);
}
is.close();
String html = baos.toString(); // 把流中的数据转换成字符串, 采用的编码是: utf-8
String charset = "utf-8";
if(html.contains("gbk") || html.contains("gb2312")
|| html.contains("GBK") || html.contains("GB2312")) { // 如果包含gbk, gb2312编码, 就采用gbk编码进行对字符串编码
charset = "gbk";
}
html = new String(baos.toByteArray(), charset); // 对原有的字节数组进行使用处理后的编码名称进行编码
baos.close();
return html;
}
}
html查看器乱码问题
/**
* 根据流返回一个字符串信息
* @param is
* @return
* @throws IOException
*/
private String getStringFromInputStream(InputStream is) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = -1;
while((len = is.read(buffer)) != -1) {
baos.write(buffer, 0, len);
}
is.close();
String html = baos.toString(); // 把流中的数据转换成字符串, 采用的编码是: utf-8
String charset = "utf-8";
if(html.contains("gbk") || html.contains("gb2312")
|| html.contains("GBK") || html.contains("GB2312")) { // 如果包含gbk, gb2312编码, 就采用gbk编码进行对字符串编码
charset = "gbk";
}
html = new String(baos.toByteArray(), charset); // 对原有的字节数组进行使用处理后的编码名称进行编码
baos.close();
return html;
}
使用HttpURLConnection采用Post方式请求数据
Servlet服务器程序
package com.itheima28.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class LoginServlet extends HttpServlet {
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String username = request.getParameter("username"); // 采用的编码是: iso-8859-1
String password = request.getParameter("password");
// 采用iso8859-1的编码对姓名进行逆转, 转换成字节数组, 再使用utf-8编码对数据进行转换, 字符串
username = new String(username.getBytes("iso8859-1"), "utf-8");
password = new String(password.getBytes("iso8859-1"), "utf-8");
System.out.println("姓名: " + username);
System.out.println("密码: " + password);
if("lisi".equals(username) && "123".equals(password)) {
/*
* getBytes 默认情况下, 使用的iso8859-1的编码, 但如果发现码表中没有当前字符,
* 会使用当前系统下的默认编码: GBK
*/
response.getOutputStream().write("登录成功".getBytes("utf-8"));
} else {
response.getOutputStream().write("登录失败".getBytes("utf-8"));
}
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
System.out.println("doPost");
doGet(request, response);
}
}
Android客户端
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.itheim28.submitdata"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.itheim28.submitdata.MainActivity2"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity" >
<EditText
android:id="@+id/et_username"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="请输入姓名" />
<EditText
android:id="@+id/et_password"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="请输入密码" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="doGet"
android:text="Get方式提交" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="doPost"
android:text="Post方式提交" />
</LinearLayout>
package com.itheim28.submitdata.utils;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import android.util.Log;
public class NetUtils {
private static final String TAG = "NetUtils";
/**
* 使用post的方式登录
* @param userName
* @param password
* @return
*/
public static String loginOfPost(String userName, String password) {
HttpURLConnection conn = null;
try {
URL url = new URL("http://10.0.2.2:8080/ServerItheima28/servlet/LoginServlet");
conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
conn.setConnectTimeout(10000); // 连接的超时时间
conn.setReadTimeout(5000); // 读数据的超时时间
conn.setDoOutput(true); // 必须设置此方法, 允许输出
// conn.setRequestProperty("Content-Length", 234); // 设置请求头消息, 可以设置多个
// post请求的参数
String data = "username=" + userName + "&password=" + password;
// 获得一个输出流, 用于向服务器写数据, 默认情况下, 系统不允许向服务器输出内容
OutputStream out = conn.getOutputStream();
out.write(data.getBytes());
out.flush();
out.close();
int responseCode = conn.getResponseCode();
if(responseCode == 200) {
InputStream is = conn.getInputStream();
String state = getStringFromInputStream(is);
return state;
} else {
Log.i(TAG, "访问失败: " + responseCode);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if(conn != null) {
conn.disconnect();
}
}
return null;
}
/**
* 使用get的方式登录
* @param userName
* @param password
* @return 登录的状态
*/
public static String loginOfGet(String userName, String password) {
HttpURLConnection conn = null;
try {
String data = "username=" + URLEncoder.encode(userName) + "&password=" + URLEncoder.encode(password);
URL url = new URL("http://10.0.2.2:8080/ServerItheima28/servlet/LoginServlet?" + data);
conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET"); // get或者post必须得全大写
conn.setConnectTimeout(10000); // 连接的超时时间
conn.setReadTimeout(5000); // 读数据的超时时间
int responseCode = conn.getResponseCode();
if(responseCode == 200) {
InputStream is = conn.getInputStream();
String state = getStringFromInputStream(is);
return state;
} else {
Log.i(TAG, "访问失败: " + responseCode);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if(conn != null) {
conn.disconnect(); // 关闭连接
}
}
return null;
}
/**
* 根据流返回一个字符串信息
* @param is
* @return
* @throws IOException
*/
private static String getStringFromInputStream(InputStream is) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = -1;
while((len = is.read(buffer)) != -1) {
baos.write(buffer, 0, len);
}
is.close();
String html = baos.toString(); // 把流中的数据转换成字符串, 采用的编码是: utf-8
// String html = new String(baos.toByteArray(), "GBK");
baos.close();
return html;
}
}
package com.itheim28.submitdata;
import com.itheim28.submitdata.utils.NetUtils;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends Activity {
private EditText etUserName;
private EditText etPassword;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
etUserName = (EditText) findViewById(R.id.et_username);
etPassword = (EditText) findViewById(R.id.et_password);
}
public void doGet(View v) {
final String userName = etUserName.getText().toString();
final String password = etPassword.getText().toString();
new Thread(
new Runnable() {
@Override
public void run() {
// 使用get方式抓去数据
final String state = NetUtils.loginOfGet(userName, password);
// 执行任务在主线程中
runOnUiThread(new Runnable() {
@Override
public void run() {
// 就是在主线程中操作
Toast.makeText(MainActivity.this, state, 0).show();
}
});
}
}).start();
}
public void doPost(View v) {
final String userName = etUserName.getText().toString();
final String password = etPassword.getText().toString();
new Thread(new Runnable() {
@Override
public void run() {
final String state = NetUtils.loginOfPost(userName, password);
// 执行任务在主线程中
runOnUiThread(new Runnable() {
@Override
public void run() {
// 就是在主线程中操作
Toast.makeText(MainActivity.this, state, 0).show();
}
});
}
}).start();
}
}
开源项目简介
github.com 开源网站, 一个大的仓库. 存放的都是框架
android-async-http-master.zip
android-smart-image-view-master.zip
直接拿来用 最火的android开源项目 csdn的帖子
开放原子开发者工作坊旨在鼓励更多人参与开源活动，与志同道合的开发者们相互交流开发经验、分享开发心得、获取前沿技术趋势。工作坊有多种形式的开发者活动，如meetup、训练营等，主打技术交流，干货满满，真诚地邀请各位开发者共同参与！
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