如何在服务中监听Back、音量键?
大体思路:在服务中创建一个悬浮窗,悬浮窗中的View添加一个自定义View;在自定义的View中重写dispatchKeyEvent、onKeyDown、onKeyUp都可,则实现了Back、音量键的监听
此种方法是从网上看到的原创网址找不到了,此处为转载
1.自定义View
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
public class MonitorView extends View {
private static final String LOG_TAG = "MonitorView";
public MonitorView(Context context) {
super(context);
}
@Override
public boolean dispatchKeyEvent(KeyEvent event) {
Log.d("suhuazhi", "keyCode " + event.getKeyCode());
return super.dispatchKeyEvent(event);
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
switch (keyCode) {
case KeyEvent.KEYCODE_BACK:
Log.i(LOG_TAG, "KeyEvent.KEYCODE_BACK");
break;
case KeyEvent.KEYCODE_MENU:
Log.i(LOG_TAG, "KeyEvent.KEYCODE_MENU");
break;
case KeyEvent.KEYCODE_VOLUME_DOWN:
Log.i(LOG_TAG, "音量减小");
break;
case KeyEvent.KEYCODE_VOLUME_UP:
Log.i(LOG_TAG, "音量增大");
break;
default:
break;
}
return super.onKeyDown(keyCode, event);
}
@Override
public boolean onKeyUp(int keyCode, KeyEvent event) {
return super.onKeyUp(keyCode, event);
}
}
2.服务中添加悬浮窗(悬浮窗中视图使用自定义的View)
import android.app.ActivityManager;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.PixelFormat;
import android.os.Build;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.text.TextUtils;
import android.view.WindowManager;
import com.lidroid.xutils.cache.LruDiskCache;
import java.util.ArrayList;
public class TestService extends Service {
@Override
public void onCreate() {
super.onCreate();
showWindow();
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
public static WindowManager mWindowManager;
public static MonitorView mMonitorView;
private void showWindow() {
if (mWindowManager == null) {
mWindowManager = (WindowManager)getSystemService(Context.WINDOW_SERVICE);
mMonitorView = new MonitorView(TestService.this);
}
WindowManager.LayoutParams params = new WindowManager.LayoutParams(
1, 1, //Must be at least 1x1
WindowManager.LayoutParams.TYPE_SYSTEM_ALERT,
WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE,
//Don't know if this is a safe default
PixelFormat.TRANSLUCENT);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {//8.0+,不设置这个flag可能会报错
params.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
} else {
params.type = WindowManager.LayoutParams.TYPE_PHONE;
}
params.format= PixelFormat.RGBA_4444;//设置背景图片
//Don't set the preview visibility to GONE or INVISIBLE
mWindowManager.addView(mMonitorView, params);
}
public static void hideWindow() {
if(null != mWindowManager) {
mWindowManager.removeView(mMonitorView);
}
}
public static void addWindow(){
if(null != mWindowManager) {
WindowManager.LayoutParams params = new WindowManager.LayoutParams(
1, 1,
WindowManager.LayoutParams.TYPE_SYSTEM_ALERT,
WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE,
PixelFormat.TRANSLUCENT);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {//8.0+,不设置这个flag可能会报错
params.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
} else {
params.type = WindowManager.LayoutParams.TYPE_PHONE;
}
params.format= PixelFormat.RGBA_4444;//设置背景图片
mWindowManager.addView(mMonitorView,params);
}
}
}
3.清单文件AndroidManifest.xml中添加
<service android:name=".service.TestService"/>