Activity按两次返回键退出
- package com.anjoyo.test;
-
- import android.app.Activity;
- import android.os.Bundle;
- import android.view.KeyEvent;
- import android.widget.Toast;
-
- public class TestActivity extends Activity {
- private long mExitTime;
-
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
-
- }
-
- public boolean onKeyDown(int keyCode, KeyEvent event) {
- if (keyCode == KeyEvent.KEYCODE_BACK) {
- if ((System.currentTimeMillis() - mExitTime) > 2000) {
- Object mHelperUtils;
- Toast.makeText(this, "再按一次退出程序", Toast.LENGTH_SHORT).show();
- mExitTime = System.currentTimeMillis();
-
- } else {
- finish();
- }
- return true;
- }
- return super.onKeyDown(keyCode, event);
- }
- }
Activity进入与退出的动画
1.在res建立目录anim放入动画效果xml文件
1.1 进入文件 push_left_in.xml
- <?xml version="1.0" encoding="utf-8"?>
- <set xmlns:android="http://schemas.android.com/apk/res/android" >
- <translate
- android:duration="300"
- android:fromXDelta="100%p"
- android:toXDelta="0" />
- <alpha
- android:duration="300"
- android:fromAlpha="0.0"
- android:toAlpha="1.0" />
- </set>
- <?xml version="1.0" encoding="utf-8"?>
- <set xmlns:android="http://schemas.android.com/apk/res/android" >
- <translate
- android:duration="300"
- android:fromXDelta="0"
- android:toXDelta="-100%p" />
- <alpha
- android:duration="300"
- android:fromAlpha="1.0"
- android:toAlpha="0.0" />
- </set>
- <?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:duration="@android:integer/config_mediumAnimTime"
- android:fromXScale="2.0"
- android:fromYScale="2.0"
- android:pivotX="50%p"
- android:pivotY="50%p"
- android:toXScale="1.0"
- android:toYScale="1.0" />
- </set>
- <?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:duration="@android:integer/config_mediumAnimTime"
- android:fromXScale="1.0"
- android:fromYScale="1.0"
- android:pivotX="50%p"
- android:pivotY="50%p"
- android:toXScale=".5"
- android:toYScale=".5" />
- <alpha
- android:duration="@android:integer/config_mediumAnimTime"
- android:fromAlpha="1.0"
- android:toAlpha="0" />
- </set>
- <style name="ThemeActivity">
- <item name="android:windowAnimationStyle">@style/AnimationActivity</item>
- <item name="android:windowNoTitle">true</item>
- </style>
- <style name="AnimationActivity" parent="@android:style/Animation.Activity">
- <item name="android:activityOpenEnterAnimation">@anim/push_left_in</item>
- <item name="android:activityOpenExitAnimation">@anim/push_left_out</item>
- <item name="android:activityCloseEnterAnimation">@anim/zoom_enter</item>
- <item name="android:activityCloseExitAnimation">@anim/zoom_exit</item>
- </style>
3.在Application中调用主题
<application
Android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/ThemeActivity"
>