Android利用广播监听按下HOME和RECENT_APPS键

MainActivity如下:

package cn.testhomekey;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.content.IntentFilter;
/**
 * Demo描述:
 * 利用广播监听设备的HOME和RECENT_APPS键被按下
 *
 * 参考资料:
 * http://blog.csdn.net/imyfriend/article/details/8293399
 * Thank you very much
 */
public class MainActivity extends Activity {
    private HomeKeyBroadcastReceiver mHomeKeyBroadcastReceiver;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
	}
    @Override
    protected void onStart() {
    	super.onStart();
    	mHomeKeyBroadcastReceiver=new HomeKeyBroadcastReceiver();
    	IntentFilter intentFilter=new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
    	this.registerReceiver(mHomeKeyBroadcastReceiver,intentFilter);
    }
	@Override
	protected void onDestroy() {
		if (mHomeKeyBroadcastReceiver!=null) {
			this.unregisterReceiver(mHomeKeyBroadcastReceiver);
		}
		super.onDestroy();
	}
}

HomeKeyBroadcastReceiver如下:

package cn.testhomekey;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
public class HomeKeyBroadcastReceiver extends BroadcastReceiver {
	private final String SYSTEM_REASON = "reason";
	//Home键
	private final String SYSTEM_HOME_KEY = "homekey";
	//最近使用的应用键
	private final String SYSTEM_RECENT_APPS = "recentapps";

	@Override
	public void onReceive(Context context, Intent intent) {
		String action = intent.getAction();
		if (action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {
			String systemReason = intent.getStringExtra(SYSTEM_REASON);
			if (systemReason != null) {
				if (systemReason.equals(SYSTEM_HOME_KEY)) {
					System.out.println("按下HOME键");
				} else if (systemReason.equals(SYSTEM_RECENT_APPS)) {
					System.out.println("按下RECENT_APPS键");
				}
			}
		}

	}

}

Manifest.xml如下:

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

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

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="cn.testhomekey.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>

        <!-- 注册广播 -->
        <receiver android:name="cn.testhomekey.HomeKeyBroadcastReceiver">

        </receiver>

    </application>

</manifest>

main.xml如下:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="监听HOME和RECENT_APPS键"
        android:layout_centerInParent="true"
    />

</RelativeLayout>