<activity
 android:name="com.woyou.activity.HomeActivity"
 android:launchMode="singleInstance" >
 <intent-filter>
  <action android:name="android.intent.action.MAIN" />
  <category android:name="android.intent.category.DEFAULT" />
  <category android:name="android.intent.category.HOME" />
  <category android:name="android.intent.category.LAUNCHER" />
 </intent-filter>
</activity>

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
    }
   }
  }
};

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

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
    }
   }
  }
 };
}

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

public boolean onKeyDown(int keyCode, KeyEvent event) {
 if(KeyEvent.KEYCODE_HOME==keyCode){
  //写要执行的动作或者任务
   android.os.Process.killProcess(android.os.Process.myPid());
 }
 return super.onKeyDown(keyCode, event);
}
@Override
public void onAttachedToWindow(){
  this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);
  super.onAttachedToWindow();
}

if (keyCode == KeyEvent.KEYCODE_HOME) {
 //在这里发送一个广播出去
}

private boolean isTesting = true;
class CatchLogThread extends Thread {
 @Override
 public void run() {
  Process mLogcatProc = null;
  BufferedReader reader = null;
  String line;
  while (isTesting) {
   try {
    // 获取logcat日志信息
    mLogcatProc = Runtime.getRuntime().exec(new String[] { "logcat", "ActivityManager:I *:S" });
    reader = new BufferedReader(new InputStreamReader(mLogcatProc.getInputStream()));
    while ((line = reader.readLine()) != null) {
     if (line.indexOf("android.intent.category.HOME") > 0) {
      isTesting = false;
      handler.sendMessage(handler.obtainMessage());
      Runtime.getRuntime().exec("logcat -c");//删除日志
      break;
     }
    }
   } catch (Exception e) {
    e.printStackTrace();
   }
  }
 }
};
Handler handler = new Handler() {
 public void handleMessage(android.os.Message msg) {
  Log.i(TAG,"Home key press");
  //do something here
 };
};