Android 应用程序多Activity跳转以后退出整个程序

在应用中肯定遇到有这样的问题，在应用中在于多的Activity中跳转，这些Activity都存在Activity栈中了。所以按返回键的时候都是一个一个的将原来的Activity弹回。如果我们想捕获到back事件之后直接退出整个程序，就要思考了。特别是2.2之后的安全机制考虑之后。

粘贴点代码，以备之后使用。

package com.jftt;import android.app.Activity;import android.app.ActivityManager;import android.app.AlertDialog;import android.content.Context;import android.content.DialogInterface;import android.content.Intent;import android.os.Bundle;import android.util.Log;import android.view.KeyEvent;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class TestLogout extends Activity {	public static final String TAG = TestLogout.class.getSimpleName();	private Button btn1;	private Button btn2;	private Button btn3;	private Button btn4;	private Button btn5;	private Button go;	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.logout);		this.onStart();		btn1 = (Button) findViewById(R.id.btn1);		btn1.setOnClickListener(new OnClickListener() {			@Override			public void onClick(View v) {				android.os.Process.killProcess(android.os.Process.myPid()); // 获取PID			}		});		btn2 = (Button) findViewById(R.id.btn2);		btn2.setOnClickListener(new OnClickListener() {			@Override			public void onClick(View v) {				System.exit(0); // 常规java、c#的标准退出法，返回值为0代表正常退出			}		});		btn3 = (Button) findViewById(R.id.btn3);		btn3.setOnClickListener(new OnClickListener() {			@Override			public void onClick(View v) {				Log.i(TAG, "close " + getPackageName());				ActivityManager am = (ActivityManager) TestLogout.this .getSystemService(Context.ACTIVITY_SERVICE);				am.restartPackage(getPackageName());				// am.killBackgroundProcesses(getPackageName());			}		});				btn4 = (Button) findViewById(R.id.btn4);		btn4.setOnClickListener(new OnClickListener() {			@Override			public void onClick(View v) {				Intent intent = new Intent();				// intent.setClass((B或者C或者D).this, A.class);				intent.setClass(TestLogout.this, TestLogout.class);				intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);				intent.putExtra("flag", 1);				startActivity(intent);			}		});				//此方法并未杀掉应用程序 而是把launcher调起		btn5 = (Button) findViewById(R.id.btn5);		btn5.setOnClickListener(new OnClickListener() {			@Override			public void onClick(View v) {				Intent startMain = new Intent(Intent.ACTION_MAIN);				startMain.addCategory(Intent.CATEGORY_HOME);				startMain.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);				startActivity(startMain);			}		});		go = (Button) findViewById(R.id.go);		go.setOnClickListener(new OnClickListener() {			@Override			public void onClick(View v) {				Intent intent = new Intent(TestLogout.this, TestLogout.class);				// intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);				startActivity(intent);			}		});	}		protected void onStart() {		super.onStart();		Intent intent = getIntent();		int x = intent.getIntExtra("flag", -1);		if (x == 0) {			finish();		}	}		@Override	public boolean onKeyDown(int keyCode, KeyEvent event) {		if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {			AlertDialog.Builder alertbBuilder = new AlertDialog.Builder(this);			alertbBuilder.setIcon(R.drawable.icon).setTitle("友情提示...").setMessage("你确定要离开吗？");			alertbBuilder.setPositiveButton("确定", new DialogInterface.OnClickListener() {						@Override						public void onClick(DialogInterface dialog, int which) {							// 结束这个Activity							int nPid = android.os.Process.myPid();							android.os.Process.killProcess(nPid);						}					});			alertbBuilder.setNegativeButton("取消", new DialogInterface.OnClickListener() {						@Override						public void onClick(DialogInterface dialog, int which) {							dialog.cancel();						}					}).create();			alertbBuilder.show();		}		return true;	}}

package com.jftt;import java.util.Stack;import android.app.Activity;public class ActiivtyStack {	private static Stack<Activity> mActivityStack;	private static ActiivtyStack instance;	private ActiivtyStack() {	}	public static ActiivtyStack getScreenManager() {		if (instance == null) {			instance = new ActiivtyStack();		}		return instance;	}	// 退出栈顶Activity	public void popActivity(Activity activity) {		if (activity != null) {			activity.finish();			mActivityStack.remove(activity);			// mActivityStack.pop();			activity = null;		}	}	// 获得当前栈顶Activity	public Activity currentActivity() {		Activity activity = mActivityStack.lastElement();		// Activity activity = mActivityStack.pop();		return activity;	}	// 将当前Activity推入栈中	public void pushActivity(Activity activity) {		if (mActivityStack == null) {			mActivityStack = new Stack<Activity>();		}		mActivityStack.add(activity);		// mActivityStack.push(activity);	}	// 退出栈中所有Activity	public void popAllActivityExceptOne(Class<Activity> cls) {		while (true) {			Activity activity = currentActivity();			if (activity == null) {				break;			}			if (activity.getClass().equals(cls)) {				break;			}			popActivity(activity);		}	}}

?logout.xml

<?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"    >	<Button		android:id="@+id/btn1"	    android:layout_width="fill_parent" 	    android:layout_height="wrap_content"		android:text="logout button1"		/>	<Button		android:id="@+id/btn2"	    android:layout_width="fill_parent" 	    android:layout_height="wrap_content"		android:text="logout button2"		/>	<Button		android:id="@+id/btn3"	    android:layout_width="fill_parent" 	    android:layout_height="wrap_content"		android:text="logout button3"		/>	<Button		android:id="@+id/btn4"	    android:layout_width="fill_parent" 	    android:layout_height="wrap_content"		android:text="go to first"		/>	<Button		android:id="@+id/btn5"	    android:layout_width="fill_parent" 	    android:layout_height="wrap_content"		android:text="go to launcher"		/>	<Button		android:id="@+id/go"	    android:layout_width="fill_parent" 	    android:layout_height="wrap_content"		android:text="go another activity"		/>    <!--	<EditText		android:id="@+id/et01"		android:layout_width="fill_parent"		android:layout_height="fill_parent"		/>	<ImageView		android:id="@+id/iv01"		android:layout_width="wrap_content"		android:layout_height="wrap_content"		/>	--></LinearLayout>

?manifest中的权限：

	<uses-permission android:name="android.permission.KILL_BACKGROUND_PROCESSES" />	<uses-permission android:name="android.permission.RESTART_PACKAGE" />

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