android开机动画不播放 android 设置activity启动退出动画 | 解决设置activity 动画不生效问题...

前提：

如果有动画，最好把activity 设置成透明，不然会有黑屏！

true

方法一：代码里面设置

getActivity().startActivity(intent,bundle);

getActivity().overridePendingTransition( R.anim.push_left_in,0);

@Override

public void finish() {

super.finish();

overridePendingTransition(0, R.anim.push_right_out);

}

注意：overridePendingTransition一定要在startActivity 或者finish 之后调用，否则没有效果！而且可能会有各种其他问题！

具体原因得看源码。我们可以先看下overridePendingTransition 的注释：

/**

* Call immediately after one of the flavors of {@link #startActivity(Intent)}

* or {@link #finish} to specify an explicit transition animation to

* perform next.

*

*

As of {@link android.os.Build.VERSION_CODES#JELLY_BEAN} an alternative

* to using this with starting activities is to supply the desired animation

* information through a {@link ActivityOptions} bundle to

* {@link #startActivity(Intent, Bundle) or a related function. This allows

* you to specify a custom animation even when starting an activity from

* outside the context of the current top activity.

*

* @param enterAnim A resource ID of the animation resource to use for

* the incoming activity. Use 0 for no animation.

* @param exitAnim A resource ID of the animation resource to use for

* the outgoing activity. Use 0 for no animation.

*/

public void overridePendingTransition(int enterAnim, int exitAnim) {

方法二：给activity 设置theme

android:theme="@style/AnimationActivityTheme"

>

@style/left_in_right_out

true

@anim/push_left_in

@anim/push_right_out

@anim/push_left_in

@anim/push_right_out

left_in xml

android:duration="@android:integer/config_mediumAnimTime"

android:fromXDelta="100%p"

android:interpolator="@android:anim/accelerate_decelerate_interpolator"

android:toXDelta="0" />

right_out xml

android:duration="@android:integer/config_mediumAnimTime"

android:fromXDelta="0"

android:interpolator="@android:anim/accelerate_decelerate_interpolator"

android:toXDelta="100%p" />

总结：

1.使用theme 的方式在有些手机上有问题，可能动画不是你设置的，但是代码的没有问题。

2.有些手机room 自己修改了动画的方向，所以，不一定是你的代码生效了，而是默认就是这种动画。

比如小米手机启动activity ，不设置就是左进右出。

3.代码代用顺序问题。顺序不对，动画不生效，而且还会产生问题。

一定要先startActivity，或者 先finish，再调用overridePendingTransition

为什么一定要先startActivity，或者 先finish？

可以跟一下源码

Activity 的overridePendingTransition

public void overridePendingTransition(int enterAnim, int exitAnim) {

try {

ActivityManager.getService().overridePendingTransition(

mToken, getPackageName(), enterAnim, exitAnim);

} catch (RemoteException e) {

}

}

可以看到会调用 ActivityManager.getService().overridePendingTransition，也就是ActivityManagerService的overridePendingTransition

@Override

public void overridePendingTransition(IBinder token, String packageName,

int enterAnim, int exitAnim) {

synchronized(this) {

ActivityRecord self = ActivityRecord.isInStackLocked(token);

if (self == null) {

return;

}

final long origId = Binder.clearCallingIdentity();

if (self.state == ActivityState.RESUMED

|| self.state == ActivityState.PAUSING) {

mWindowManager.overridePendingAppTransition(packageName,

enterAnim, exitAnim, null);

}

Binder.restoreCallingIdentity(origId);

}

}

又会调用mWindowManager (WindowManagerService) 的overridePendingAppTransition

@Override

public void overridePendingAppTransition(String packageName,

int enterAnim, int exitAnim, IRemoteCallback startedCallback) {

synchronized(mWindowMap) {

mAppTransition.overridePendingAppTransition(packageName, enterAnim, exitAnim,

startedCallback);

}

}

最终调用 mAppTransition.overridePendingAppTransition。也就是AppTransition 这个类。

void overridePendingAppTransition(String packageName, int enterAnim, int exitAnim,

IRemoteCallback startedCallback) {

if (isTransitionSet()) {

clear();

mNextAppTransitionType = NEXT_TRANSIT_TYPE_CUSTOM;

mNextAppTransitionPackage = packageName;

mNextAppTransitionEnter = enterAnim;

mNextAppTransitionExit = exitAnim;

postAnimationCallback();

mNextAppTransitionCallback = startedCallback;

} else {

postAnimationCallback();

}

}

boolean isTransitionSet() {

return mNextAppTransition != TRANSIT_UNSET;

}

可以看到这里面有一个isTransitionSet() 方法，默认是TRANSIT_UNSET，只有startActivity 或者finish 之后，这个mNextAppTransition 才不是TRANSIT_UNSET。所以需要先startActivity 或者finish，然后overridePendingTransition才会有作用。每次动画结束，这个值又会被值为TRANSIT_UNSET。