package com.example.keyeventdemo;
 
import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.view.KeyEvent;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
    private TextView key_result;
    private String desc = "";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        key_result = (TextView) findViewById(R.id.key_result);
    }
  @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        key_result = (TextView) findViewById(R.id.key_result);
    }
 
   @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        desc = String.format("%sphysical key coce is %d", desc, keyCode);
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            desc = String.format("%s, KEYCODE_BACK", desc);
        } else if (keyCode == KeyEvent.KEYCODE_MENU) {
            desc = String.format("%s, KEYCODE_MENU", desc);
        } else if (keyCode == KeyEvent.KEYCODE_VOLUME_UP) {
            desc = String.format("%s, KEYCODE_VOLUME_UP", desc);
        } else if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) {
            desc = String.format("%s, KEYCODE_VOLUME_DOWN", desc);
        }else  {
            desc = String.format("%s, KEYCODE_VOLUME is unknown", desc);
        }
        desc = desc + "\n";
        key_result.setText(desc);
        //返回true表示不再响应系统动作，返回false表示继续响应系统动作
        return true;
      // return  false;
    }
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="5dp">
 
    <TextView
        android:id="@+id/tv_hard"
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:gravity="center"
        android:text="please press the physics button"
        android:textSize="16sp" />
 
    <TextView
        android:id="@+id/key_result"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="16sp" />
 
</LinearLayout>

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public class MyKeyEventService extends Service {

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        final IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
        filter.addAction(Intent.ACTION_SCREEN_OFF);
        filter.addAction(Intent.ACTION_USER_PRESENT);
        final BroadcastReceiver mReceiver = new MainActivity.ScreenReceiver();
        registerReceiver(mReceiver, filter);
        return super.onStartCommand(intent, flags, startId);
    }

    public class LocalBinder extends Binder {
        MyKeyEventService getService() {
            return MyKeyEventService.this;
        }
    }

}

<service android:name=".MyKeyEventService">
    <intent-filter>
        <action android:name="android.intent.action.BOOT_COMPLETED" />
    </intent-filter>
</service>

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "MyKeyEvent";

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

        startService(new Intent(this, LockService.class));

    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        stopService(new Intent(MainActivity.this, LockService.class));
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        switch (keyCode) {
            case KeyEvent.KEYCODE_VOLUME_UP:
                Log.i(TAG, "onKeyDown: vol+ down");
                return true;
//                break;

            case KeyEvent.KEYCODE_VOLUME_DOWN:
                Log.i(TAG, "onKeyDown: vol- down");
                return true;
//                break;

            case KeyEvent.KEYCODE_POWER:
                Log.i(TAG, "onKeyDown: power down");
                return true;
//                break;

            default:
                break;
        }
        return super.onKeyDown(keyCode, event);
    }

    @Override
    public boolean onKeyUp(int keyCode, KeyEvent event) {
        switch (keyCode) {
            case KeyEvent.KEYCODE_VOLUME_UP:
                Log.i(TAG, "onKeyDown: vol+ up");
                return true;
//                break;

            case KeyEvent.KEYCODE_VOLUME_DOWN:
                Log.i(TAG, "onKeyDown: vol- up");
                return true;
//                break;

            case KeyEvent.KEYCODE_POWER:
                Log.i(TAG, "onKeyDown: power up");
                return true;
//                break;

            default:
                break;
        }
        return super.onKeyUp(keyCode, event);
    }

    static class ScreenReceiver extends BroadcastReceiver {

        @Override
        public void onReceive(final Context context, final Intent intent) {
//            Log.e(TAG, "onReceive " + intent.getAction());
            if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
                // do whatever you need to do here
                Log.e(TAG, "Screen Off");

            } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
                // and do whatever you need to do here
                Log.e(TAG, "Screen On");

            }
        }
    }

}

• 安卓（Android） 监听按键长按事件
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