活动导航:使用popEnter和popExit类似片段的自定义动画

Question

使用以下代码可以使用动画更改活动:

Bundle animation = ActivityOptions.makeCustomAnimation(App.getContext(), R.anim.enter_from_right, R.anim.exit_to_left).toBundle();
startActivity(intent, animation);

对于片段,您可以在FragmentTransaction上执行类似的操作:

// ...
transaction.setCustomAnimations(R.anim.enter_from_right, R.anim.exit_to_left);
// ...

这有效!但是我想在按下时弹出一个动画(从后台弹出).对于片段,您只需添加2个动画资源(popEnter和popExit):

transaction.setCustomAnimations(R.anim.enter_from_right, R.anim.exit_to_left, R.anim.enter_from_left, R.anim.exit_to_right);

如何为活动创建相同的"背景动画"？

Answer 1

我发现了一种不同但很简单的方法似乎很有效.活动的动画也可以使用overridePendingTransition来执行,因此当活动完成后,您只需使用该方法.

在BaseActivity中实现这些覆盖是最有效的,BaseActivity由项目中的所有活动进行扩展.现在,您的所有活动将在开始新活动时自动包含退出动画和动画:

public abstract class BaseActivity extends AppCompatActivity {

    @Override
    public void finish() {
        super.finish();
        onLeaveThisActivity();
    }

    protected void onLeaveThisActivity() {
        overridePendingTransition(R.anim.enter_from_left, R.anim.exit_to_right);
    }

    // It's cleaner to animate the start of new activities the same way.
    // Override startActivity(), and call *overridePendingTransition*
    // right after the super, so every single activity transaction will be animated:

    @Override
    public void startActivity(Intent intent) {
        super.startActivity(intent);
        onStartNewActivity();
    }

    @Override
    public void startActivity(Intent intent, Bundle options) {
        super.startActivity(intent, options);
        onStartNewActivity();
    }

    @Override
    public void startActivityForResult(Intent intent, int requestCode) {
        super.startActivityForResult(intent, requestCode);
        onStartNewActivity();
    }

    @Override
    public void startActivityForResult(Intent intent, int requestCode, Bundle options) {
        super.startActivityForResult(intent, requestCode, options);
        onStartNewActivity();
    }

    protected void onStartNewActivity() {
        overridePendingTransition(R.anim.enter_from_right, R.anim.exit_to_left);
    }
}

为了解决这个问题,我将包含4个动画资源:

enter_from_right

<translate xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="500"
    android:fromXDelta="100%p"
    android:toXDelta="0%p"/>

exit_to_left

<translate xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="500"
    android:fromXDelta="0%p"
    android:toXDelta="-100%p"/>

enter_from_left

<translate xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="500"
    android:fromXDelta="-100%p"
    android:toXDelta="0%p"/>

exit_to_right

<translate xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="500"
    android:fromXDelta="0%p"
    android:toXDelta="100%p"/>

PS.您可能希望在开始/主要活动中排除退出动画;-)

public class MainMenuActivity extends BaseActivity {
    ....
    @Override
    protected void onLeaveThisActivity() {
        // Don't use an exit animation when leaving the main activity!
    }
}