Android知识笔记：Android 仿iOS 侧滑关闭Activity框架透底问题

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港迪学编程

940人浏览 · 2024-03-16 14:28:52

港迪学编程 · 2024-03-16 14:28:52 发布

方案A: 修改所有Activity Theme windowIsTranslucent = true 属性

同样的配方同样的味道替换所有所有Activity Theme 将window 改为不透明，背景颜色改为透明

运行后的效果图：

闪烁透底的问题是解决了，但是侧滑框架出现了侧滑后看不到底部内容，方案A失败；

方案B：动态设置Activity Theme

在当前App退到后台时替换Activity为非透明主题，在Activity恢复到前台被点击时替换为透明主题；如何动态修改Activity Theme？

@Override

protected void onCreate(Bundle savedInstanceState) {

if (current_theme!= -1){

this.setTheme(current_theme);

}

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

findViewById(R.id.bt_theme).setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

changeTheme(GREEN_THEME);

}

});

}

public void changeTheme(int index) {

switch (index) {

case DEFAULT_THEME:

current_theme = R.style.DefaultTheme;

break;

case GREEN_THEME:

current_theme = R.style.GreenTheme;

break;

case ORANGE_THEME:

current_theme = R.style.OrangeTheme;

break;

default:

break;

}

protected void reload() {

Intent intent = getIntent();

overridePendingTransition(0, 0);

intent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);

finish();

overridePendingTransition(0, 0);

startActivity(intent);

}

其实设置主题必须在任何view创建之前，所以我们不可能在activity的onCreate之后来更改主题，如果一定要做，就只能调用setTheme()，然后调用recreate()，重新创建一个activity，并且销毁上一个activity; 所以这个方案并不可行，整个界面必须销毁重建。已知的Android theme修改方式

AndroidManifest 设置Activity Theme
在Activity setContentView执行前调用setTheme

可以通过其他方式修改Activity windowIsTranslucent 属性吗？

方案B+：反射动态设置Activity windowIsTranslucent

查阅Activity源码，看一下他是如何变成透明的

/**

Convert a translucent themed Activity {@link android.R.attr#windowIsTranslucent} back from
opaque to translucent following a call to {@link #convertFromTranslucent()}.
Calling this allows the Activity behind this one to be seen again. Once all such Activities
have been redrawn {@link TranslucentConversionListener#onTranslucentConversionComplete} will
be called indicating that it is safe to make this activity translucent again. Until
{@link TranslucentConversionListener#onTranslucentConversionComplete} is called the image
behind the frontmost Activity will be indeterminate.
This call has no effect on non-translucent activities or on activities with the
{@link android.R.attr#windowIsFloating} attribute.
@param callback the method to call when all visible Activities behind this one have been
drawn and it is safe to make this Activity translucent again.
@param options activity options delivered to the activity below this one. The options
are retrieved using {@link #getActivityOptions}.
@return true if Window was opaque and will become translucent or
false if window was translucent and no change needed to be made.
@see #convertFromTranslucent()
@see TranslucentConversionListener
@hide

@SystemApi

public boolean convertToTranslucent(TranslucentConversionListener callback,

ActivityOptions options) {

boolean drawComplete;

try {

mTranslucentCallback = callback;

mChangeCanvasToTranslucent = ActivityManager.getService().convertToTranslucent(

mToken, options == null ? null : options.toBundle());

WindowManagerGlobal.getInstance().changeCanvasOpacity(mToken, false);

drawComplete = true;

} catch (RemoteException e) {

// Make callback return as though it timed out.

mChangeCanvasToTranslucent = false;

drawComplete = false;

}

if (!mChangeCanvasToTranslucent && mTranslucentCallback != null) {

// Window is already translucent.

mTranslucentCallback.onTranslucentConversionComplete(drawComplete);

}

return mChangeCanvasToTranslucent;

}

/**

Convert a translucent themed Activity {@link android.R.attr#windowIsTranslucent} to a
fullscreen opaque Activity.
Call this whenever the background of a translucent Activity has changed to become opaque.
Doing so will allow the {@link android.view.Surface} of the Activity behind to be released.
This call has no effect on non-translucent activities or on activities with the
{@link android.R.attr#windowIsFloating} attribute.
@see #convertToTranslucent(android.app.Activity.TranslucentConversionListener,
ActivityOptions)
@see TranslucentConversionListener
@hide