Android监听是否点击了home键或者锁屏键

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

public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

IntentFilter filter = new IntentFilter();
//锁屏广播，由系统发出
filter.addAction(Intent.ACTION_SCREEN_ON);
//锁屏广播，由系统发出
filter.addAction(Intent.ACTION_SCREEN_OFF);
//点击home键广播，由系统发出
filter.addAction(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
registerReceiver(homeAndLockReceiver, filter);
}

/**
* 监听是否点击了home键将客户端推到后台
*/
private BroadcastReceiver homeAndLockReceiver = new BroadcastReceiver() {
String SYSTEM_REASON = "reason";
String SYSTEM_HOME_KEY = "homekey";

@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", Toast.LENGTH_SHORT).show();
}
} else if (action.equals(Intent.ACTION_SCREEN_ON)) {
//屏幕亮了
Log.i("lock-", "--on");

} else if (action.equals(Intent.ACTION_SCREEN_OFF)) {
//屏幕黑了
Log.i("lock-", "--off");
}
}
};
}