解决android退出整个应用方法

最新推荐文章于 2021-05-26 02:33:40 发布

最新推荐文章于 2021-05-26 02:33:40 发布 · 268 阅读

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#移动开发

本文介绍了一个通过广播接收器实现的多Activity间安全切换及退出的应用案例。该方案允许用户在三个Activity间自由跳转，并确保点击返回键时能够安全地关闭整个应用，避免因未正确注销广播接收器导致的异常。

我夕

不解释了，直接说下测试的例子

例子：三个Activity之间任意切换，然后在任意一个界面按下模拟器上的返回键，观察是否退出应用；

先创建一个广播接收器：

package com.study.test;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;

public class MyBroadCast extends BroadcastReceiver {

	@Override
	public void onReceive(Context context, Intent intent) {
		// TODO Auto-generated method stub
		
		//Activity被销毁时如果没有解除注册，系统会报异常
		((Activity)context).unregisterReceiver(this);
		
		((Activity)context).finish();

	}
}

工具类：

package com.study.test;

import android.app.Activity;
import android.content.Intent;
import android.content.IntentFilter;

public class Util {
	
	 Activity activity;
	 public Util(Activity activity){
		 this.activity = activity;
	 }

	 /**
	  * 注册广播
	  */
	public  void  registerBroadcastReceiver() {
		
		IntentFilter intentFilter = new IntentFilter();
		intentFilter.addAction("CLOSE");
		activity.registerReceiver(new MyBroadCast(), intentFilter);
	}
	/**
	 * 关闭Activity
	 */
	public void exitApp(){
		
		Intent intent =new Intent();
		intent.setAction("CLOSE");
		activity.sendBroadcast(intent);
		activity.finish();
	}
}

MainActivity

package com.study.test;

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

public class MainActivity extends Activity {

	Button btn1;
	Button btn2;
	TextView tv;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        tv = (TextView) findViewById(R.id.tv);
        tv.setText("===========MainActivity===========");
        
        btn1 = (Button) findViewById(R.id.btn1);
        btn1.setText("to AActivity");
        btn1.setOnClickListener(new ButtonClickListener());

        
        btn2 = (Button) findViewById(R.id.btn2);
        btn2.setText("to BActivity");
        btn2.setOnClickListener(new ButtonClickListener());
        
        
    }
    
    public class ButtonClickListener implements View.OnClickListener {

		@Override
		public void onClick(View v) {
			// TODO Auto-generated method stub
			switch (v.getId()) {
			case R.id.btn1:
				startActivity(new Intent(MainActivity.this, AActivity.class));
				break;

			case R.id.btn2 :
				startActivity(new Intent(MainActivity.this, BActivity.class));
				break;
				
			}
			
		}
    	
    }
    
    @Override
    protected void onResume() {
    	// TODO Auto-generated method stub
    	super.onResume();
    	//注册广播
    	new Util(this).registerBroadcastReceiver();
    }
    
	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		// TODO Auto-generated method stub
		if(keyCode == KeyEvent.KEYCODE_BACK) {
			System.out.println("---------------->main");
		  new Util(this).exitApp();
		}
		return super.onKeyDown(keyCode, event);
		
	}

}

AActivity

package com.study.test;


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

public class AActivity extends Activity {


	Button btn1;
	Button btn2;
	TextView tv;
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        tv = (TextView) findViewById(R.id.tv);
        tv.setText("AActivity------------->");
        
        btn1 = (Button) findViewById(R.id.btn1);
        btn1.setText("to MainActivity");
        btn1.setOnClickListener(new ButtonClickListener());
        
        btn2 = (Button) findViewById(R.id.btn2);
        btn2.setText("to BActivity");
        btn2.setOnClickListener(new ButtonClickListener());

    }
    
    public class ButtonClickListener implements View.OnClickListener {

		@Override
		public void onClick(View v) {
			// TODO Auto-generated method stub
			switch (v.getId()) {
			case R.id.btn1:
				startActivity(new Intent(AActivity.this, MainActivity.class));
				break;

			case R.id.btn2 :
				startActivity(new Intent(AActivity.this, BActivity.class));
				break;

			}
			
		}
    	
    }
    
    @Override
    protected void onResume() {
    	// TODO Auto-generated method stub
    	super.onResume();
    	new Util(this).registerBroadcastReceiver();
    	
    }
	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		// TODO Auto-generated method stub
		if(keyCode == KeyEvent.KEYCODE_BACK) {
			System.out.println("---------------->a");
			new Util(this).exitApp();
			
		}
		return super.onKeyDown(keyCode, event);
		
	}
    

}

BActivity

package com.study.test;


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

public class BActivity extends Activity {

	Button btn1;
	Button btn2;
	TextView tv;
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        tv = (TextView) findViewById(R.id.tv);
        tv.setText("BActivity------------->");
        
        btn1 = (Button) findViewById(R.id.btn1);
        btn1.setText("to MainActivity");
        btn1.setOnClickListener(new ButtonClickListener());
        
        btn2 = (Button) findViewById(R.id.btn2);
        btn2.setText("to AActivity");
        btn2.setOnClickListener(new ButtonClickListener());
        

        
    }
    
    public class ButtonClickListener implements View.OnClickListener {

		@Override
		public void onClick(View v) {
			// TODO Auto-generated method stub
			switch (v.getId()) {
			case R.id.btn1:
				startActivity(new Intent(BActivity.this, MainActivity.class));
				break;

			case R.id.btn2 :
				startActivity(new Intent(BActivity.this, AActivity.class));
				break;
				
			}
			
		}
    	
    }
    @Override
    protected void onResume() {
    	// TODO Auto-generated method stub
    	super.onResume();
    	//注册广播
    	new Util(this).registerBroadcastReceiver();
    }
    
	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		// TODO Auto-generated method stub
		if(keyCode == KeyEvent.KEYCODE_BACK) {
			System.out.println("---------------->BActivity界面");
			 new Util(this).exitApp();
			
		}
		return super.onKeyDown(keyCode, event);
		
	}

}

布局文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/tv" 
        android:textSize="20dp"
        android:textColor="@android:color/white"
        />
    <Button 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/btn1"
        />
        <Button 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/btn2"
        />

        <TextView 
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:textSize="18dp"
            android:text="测试开始，三个Activity之间任意切换，然后在任何界面按下返回键都会安全的关闭整个应用"
            />

</LinearLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.study.test"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="8" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        
        <activity  android:name=".AActivity"/>
        <activity  android:name=".BActivity"/>
    </application>

</manifest>

测试界面：