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，以是我们不可能在activity的onCreate之厥后更改主题，假如一定要做，就只能调用setTheme()，然后调用recreate()，重新创建一个activity，而且销毁上一个activity; 以是这个方案并不可行，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，看一下他是如何酿成透明的
/**
- 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
*/
@SystemApi
public void convertFromTranslucent() {
try {
mTranslucentCallback = null;
if (ActivityManager.getService().convertFromTranslucent(mToken)) {
WindowManagerGlobal.getInstance().changeCanvasOpacity(mToken, true);
}
} catch (RemoteException e) {
// pass
}
}
可以看到这个两个Api就是将Activity转化为投透明和非透明通过 ActivityManager.getService() 和 WindowManagerGlobal.getInstance().changeCanvasOpacity()修改Window透明属性;
- convertToTranslucent //将当前Activity Window 设置为透明
- convertFromTranslucent //将当前 Activity Window 设置为非透明
由于是系统Api 并有 @hide 标注 正常是无法调用的，可以通过反射来调用； 反射调用如下：
/**
- Convert a translucent themed Activity
- 将Activity 改为透明
*/
public static void convertActivityToTranslucent(Activity activity) {
long timeMillis = SystemClock.currentThreadTimeMillis();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
convertActivityToTranslucentAfterL(activity);
} else {
convertActivityToTranslucentBeforeL(activity);
}
FxLog.d("convertActivity : convertActivityToTranslucent time = " + (SystemClock.currentThreadTimeMillis() - timeMillis));
}
/**
- Calling the convertToTranslucent method on platforms before Android 5.0
*/
public static void convertActivityToTranslucentBeforeL(Activity activity) {
try {
Class<?>[] classes = Activity.class.getDeclaredClasses();
Class<?> translucentConversionListenerClazz = null;
for (Class clazz : classes) {
if (clazz.getSimpleName().contains(“TranslucentConversionListener”)) {
translucentConversionListenerClazz = clazz;
}
}
Method method = Activity.class.getDeclaredMethod(“convertToTranslucent”,
translucentConversionListenerClazz);
method.setAccessible(true);
method.invoke(activity, new Object[] {
null
});
} catch (Throwable t) {
}
}
/**
- Calling the convertToTranslucent method on platforms after Android 5.0
*/
private static void convertActivityToTranslucentAfterL(Activity activity) {
try {
Method getActivityOptions = Activity.class.getDeclaredMethod(“getActivityOptions”);
getActivityOptions.setAccessible(true);
Object options = getActivityOptions.invoke(activity);
Class<?>[] classes = Activity.class.getDeclaredClasses();
Class<?> translucentConversionListenerClazz = null;
for (Class clazz : classes) {
if (clazz.getSimpleName().contains(“TranslucentConversionListener”)) {
translucentConversionListenerClazz = clazz;
}
}
Method convertToTranslucent = Activity.class.getDeclaredMethod(“convertToTranslucent”,
translucentConversionListenerClazz, ActivityOptions.class);
convertToTranslucent.setAccessible(true);
convertToTranslucent.invoke(activity, null, options);
} catch (Throwable t) {
}
}
性能问题的思考
这样的反射是否对性能有损耗呢？在调用时做了耗时测试 在日志打印中可以看到性能完全不会受影响；
为了进一步优化并减少反射调用，仅在用户触发侧滑、侧滑完全闭适时修改Activity透明属性
public void setWindowToTranslucent(boolean translucent) {
if (isTranslucentWindow == translucent || !isSlidingEnabled()){
return;
}
isTranslucentWindow = translucent;
if (isTranslucentWindow) {
convertActivityToTranslucent(((Activity) getContext()));
} else {
convertActivityFromTranslucent(((Activity) getContext()));
}
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