Android切换Activity时的淡入动画和缩小动画

Android切换Activity时的淡入动画和缩小动画

实现在Activity切换过程中的淡入和缩小的动画效果。先创建一个主Activty布局。主Activity有两个按钮一个是实现切换的淡入效果，一个是实现缩小效果。

main.xml布局如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="本程序实现在Activity切换过程中的淡入和放大的动画效果!"
/>

<Button
android:id="@+id/fadein"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Fade in"
/>
<Button
android:id="@+id/zoomin"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Zoom in"
/>
</LinearLayout>

主Activity内容:

package com.xiaochun91103;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity {
/** Called when the activity is first created. */
private Button fadeIn,zoomOut;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

fadeIn = (Button)findViewById(R.id.fadein);
fadeIn.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
startActivity(new Intent(MainActivity.this,ShowActivity.class));
overridePendingTransition(R.anim.fade, R.anim.hold);//切换Activity的过渡动画
}
});

zoomOut = (Button)findViewById(R.id.zoomout);
zoomOut.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
startActivity(new Intent(MainActivity.this,ShowActivity.class));
overridePendingTransition(R.anim.zoom_enter, R.anim.zoom_exit);
}
});
}
}

动画效果的xml如下,fade.xml:

<?xml version="1.0" encoding="utf-8"?>
<alpha xmlns:android="http://schemas.android.com/apk/res/android"
android:interpolator="@android:anim/accelerate_interpolator"
android:fromAlpha="0.0" android:toAlpha="1.0"
android:duration="@android:integer/config_longAnimTime" />

hold.xml:

<?xml version="1.0" encoding="utf-8"?>
<translate xmlns:android="http://schemas.android.com/apk/res/android"
android:interpolator="@android:anim/accelerate_interpolator"
android:fromXDelta="0" android:toXDelta="0"
android:duration="@android:integer/config_longAnimTime" />

zoom_enter.xml:

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:interpolator="@android:anim/decelerate_interpolator">
<scale android:fromXScale="2.0" android:toXScale="1.0"
android:fromYScale="2.0" android:toYScale="1.0"
android:pivotX="50%p" android:pivotY="50%p"
android:duration="@android:integer/config_mediumAnimTime" />
</set>

zoom_exit.xml:

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:interpolator="@android:anim/decelerate_interpolator"
android:zAdjustment="top">
<scale android:fromXScale="1.0" android:toXScale=".5"
android:fromYScale="1.0" android:toYScale=".5"
android:pivotX="50%p" android:pivotY="50%p"
android:duration="@android:integer/config_mediumAnimTime" />
<alpha android:fromAlpha="1.0" android:toAlpha="0"
android:duration="@android:integer/config_mediumAnimTime"/>
</set>

另外showActivity仅仅做一个界面不做任何操作。所以用户可以随便编一个界面。用来在Activity的切换中显示过渡的动画。