Android Studio监控Home按键

思路：当HOME键被按下的时候，系统会发出广播，我们写一个自定义的广播接收器，就可以拦截到它。

自定义一个广播接收器：

class HomePressReceiver extends BroadcastReceiver {
        final String SYSTEM_DIALOG_REASON_KEY = "reason";
        final String SYSTEM_DIALOG_REASON_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_DIALOG_REASON_KEY);
                if (reason != null && reason.equals(SYSTEM_DIALOG_REASON_HOME_KEY)) {
                    Log.d(TAG, "onReceive: home key pressed");
                }
            }
        }
    }

先定义一个IntentFilter用来过滤指定的广播，一个接收器。

private IntentFilter homeKeyFilter;
private HomePressReceiver homePressReceiver;
private String TAG ="aiden: "; //debug用

接下来，在onCreate中，添加：

homeKeyFilter = new IntentFilter();
homeKeyFilter.addAction(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);

homePressReceiver = new HomePressReceiver();
registerReceiver(homePressReceiver, homeKeyFilter);

在退出APP的时候，需要反注册这个接收器。所以在onDestroy中添加：

           if(homePressReceiver != null){
           try {
                unregisterReceiver(homePressReceiver);
            } catch (Exception e) {
                Log.e(TAG, "unregisterReceiver homePressReceiver failure :"+e.getCause());
            }
        }

完整代码如下：

package com.aiden.homekeydetection;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;

public class MainActivity extends AppCompatActivity {


    private IntentFilter homeKeyFilter;

    private HomePressReceiver homePressReceiver;

    private String TAG ="aiden: ";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        homeKeyFilter = new IntentFilter();
        homeKeyFilter.addAction(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);

        homePressReceiver = new HomePressReceiver();

        registerReceiver(homePressReceiver, homeKeyFilter);

    }

    public void onDestroy() {

        if(homePressReceiver != null){
            try {
                unregisterReceiver(homePressReceiver);
            } catch (Exception e) {
                Log.e(TAG, "unregisterReceiver homePressReceiver failure :"+e.getCause());
            }
        }
        super.onDestroy();
    }

    class HomePressReceiver extends BroadcastReceiver {
        final String SYSTEM_DIALOG_REASON_KEY = "reason";
        final String SYSTEM_DIALOG_REASON_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_DIALOG_REASON_KEY);
                if (reason != null && reason.equals(SYSTEM_DIALOG_REASON_HOME_KEY)) {
                    Log.d(TAG, "onReceive: home key pressed");
                }
            }
        }
    }

}

不需要在AndroidManifest.xml中做任何修改。
测试通过。