Android 应用程序多Activity跳转之后退出整个程序

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" />

 

 

评论

1 楼 敲敲大葱头 2011-08-01  

好文章，谢谢