监听android home键的实现方式

监听android home键的实现方式

1.  通过广播的方式监听home键，这个比较好使

   首先是创建一个广播接受者

private BroadcastReceiver mHomeKeyEventReceiver = new BroadcastReceiver() {
		String SYSTEM_REASON = "reason";
		String SYSTEM_HOME_KEY = "homekey";
		String SYSTEM_HOME_KEY_LONG = "recentapps";
		 
		@Override
		public void onReceive(Context context, Intent intent) {
			String action = intent.getAction();
			if (action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {
				String reason = intent.getStringExtra(SYSTEM_REASON);
				if (TextUtils.equals(reason, SYSTEM_HOME_KEY)) {
					 //表示按了home键,程序到了后台
					Toast.makeText(getApplicationContext(), "home", 1).show();
				}else if(TextUtils.equals(reason, SYSTEM_HOME_KEY_LONG)){
					//表示长按home键,显示最近使用的程序列表
				}
			} 
		}
	};

注册监听

可以在Activity里注册，也可以在Service里面

//注册广播
		registerReceiver(mHomeKeyEventReceiver, new IntentFilter(
				Intent.ACTION_CLOSE_SYSTEM_DIALOGS));

完整的代码如下：

package com.example.homedemo;

import android.os.Bundle;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.text.TextUtils;
import android.view.Menu;
import android.widget.Toast;

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		//注册广播
		registerReceiver(mHomeKeyEventReceiver, new IntentFilter(
				Intent.ACTION_CLOSE_SYSTEM_DIALOGS));
	}

	 
	/**
	 * 监听是否点击了home键将客户端推到后台
	 */
	private BroadcastReceiver mHomeKeyEventReceiver = new BroadcastReceiver() {
		String SYSTEM_REASON = "reason";
		String SYSTEM_HOME_KEY = "homekey";
		String SYSTEM_HOME_KEY_LONG = "recentapps";
		 
		@Override
		public void onReceive(Context context, Intent intent) {
			String action = intent.getAction();
			if (action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {
				String reason = intent.getStringExtra(SYSTEM_REASON);
				if (TextUtils.equals(reason, SYSTEM_HOME_KEY)) {
					 //表示按了home键,程序到了后台
					Toast.makeText(getApplicationContext(), "home", 1).show();
				}else if(TextUtils.equals(reason, SYSTEM_HOME_KEY_LONG)){
					//表示长按home键,显示最近使用的程序列表
				}
			} 
		}
	};
}