android - 试图让一个简单的锁屏应用程序工作，与 Service & Reciever 作斗争

Question

我正在努力制作我的基本锁屏应用程序。开始时，该应用程序显示一个基本 Activity 屏幕，带有一个 ImageView (显示存储中的图像)和一个 TextView(显示日期和时间)。向上滑动时， Activity 回去。我正在努力解决的问题是，当屏幕关闭和打开时，事件接收器应该发送此事件并且我的 Activity 应该再次出现在前台。事实并非如此。 我不完全确定如何使用我的服务和 broadcastreceiver 来实现这一目标。如有任何帮助，我们将不胜感激。

我的 AndroidManifest 文件:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.kjtest2"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="11"
    android:targetSdkVersion="19" />

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

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/Theme.AppCompat.Light.NoActionBar" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN"/>
            <category android:name="android.intent.category.LAUNCHER"/>
        </intent-filter>

    <receiver 
        android:name="com.example.kjtest2.EventsReciever"
        android:enabled="true" 
        android:exported="false">
        <intent-filter>
            <action android:name="android.intent.action.SCREEN_OFF"/>
            <action android:name="android.intent.action.SCREEN_ON"/>
            <action android:name="android.intent.action.BOOT_COMPLETED"/>
        </intent-filter>
    </receiver>      

    <service 
        android:enabled="true"
        android:name="com.example.kjtest2.myService"/>        

    <activity
        android:name="com.example.kjtest2.MainActivity"
        android:label="@string/app_name" 
        >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
            <category android:name="android.intent.category.HOME" />
            <category android:name="android.intent.category.DEFAULT" />                
        </intent-filter>
    </activity>
</application>

我的接收者:

       import android.content.BroadcastReceiver;
       import android.content.Context;
       import android.content.Intent;
       import android.util.Log;

    public class EventsReciever extends BroadcastReceiver {

    public boolean wasScreenOn = true;
    @Override
    public void onReceive(Context context, Intent recievedIntent) {

        Log.i("Check","[BroadCastReciever] onRecieve()");

        if (recievedIntent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
            wasScreenOn = false;
            Log.i("Check","[BroadCastReciever] Screen went OFF");
        } else if (recievedIntent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
            wasScreenOn = true;
            Log.i("Check","[BroadCastReciever] Screen went ON");

            Intent intent = new Intent(context, MainActivity.class);
            context.startActivity(intent);
        }
        else if(recievedIntent.getAction().equals(Intent.ACTION_BOOT_COMPLETED))
        {
            Intent intent = new Intent(context, MainActivity.class);
            context.startActivity(intent);
        }
    }

}

我在 Activity 中的 onCreate 代码:

    protected void onCreate(Bundle savedInstanceState) {
    Log.i("event", "activity onCreate");
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    super.onCreate(savedInstanceState);

    Intent intent = new Intent(this, EventsReciever.class);
    setContentView(R.layout.activity_main);

    /** REMOVING KEYGUARD RECEIVER **/
    KeyguardManager keyguardManager =   (KeyguardManager)getSystemService(KEYGUARD_SERVICE);
    KeyguardLock lock = keyguardManager.newKeyguardLock(KEYGUARD_SERVICE);
    lock.disableKeyguard();     
    setTime();
    changeImage();
    ImageView img2 = (ImageView)findViewById(R.id.imageView);
    img2.setOnTouchListener(new OnSwipeTouchListener(this) {
        @Override
        public void onSwipeLeft() {
            Toast.makeText(MainActivity.this, "Swipe left", Toast.LENGTH_SHORT)
              .show();
            changeImage();
            Log.i("event","onSwipeLeft");
        }
        @Override
        public void onSwipeRight() {
            TextView tvDisplayDate = (TextView)findViewById(R.id.date1);
            CustomDigitalClock cdc = (CustomDigitalClock)findViewById(R.id.dc1);
            if (tvDisplayDate.getVisibility()==View.VISIBLE) {
                tvDisplayDate.setVisibility(View.GONE);
                cdc.setVisibility(View.GONE);
            } else {
                tvDisplayDate.setVisibility(View.VISIBLE);
                cdc.setVisibility(View.VISIBLE);
            }
        }
        @Override           
        public void onSwipeUp() {
            Toast.makeText(MainActivity.this, "Swipe up", Toast.LENGTH_SHORT)
              .show();
            MainActivity.this.moveTaskToBack(true);
        }
        @Override           
        public void onSwipeDown() {
            Toast.makeText(MainActivity.this, "Swipe down", Toast.LENGTH_SHORT)
              .show();
        }
    });
}

最后是我的服务:

public class myService extends Service{
private NotificationManager mNM;
private int NOTIFICATION = R.string.local_service_started;
private final IBinder mBinder = new MyBinder();
private Messenger outMessenger;

@Override
public void onCreate() {

    /** INITIALIZE RECEIVER **/
    //RegisterReciever();
    Log.i("event", "ServiceStarted");
    mNM = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);

    // Display a notification about us starting.  We put an icon in the status bar.
    showNotification();
}
}

截至目前，接收器和服务尚未启动。我已经能够通过动态注册事件来启动它们，但我认为这不是必需的。在 list 中注册事件对于我的应用程序应该足够了，不是吗？

感谢您的帮助。

Answer 1

通过在 Activity onCreate() 中包含 startService(new Intent(this,MyService.class)); 语句确保您的服务正在运行

实际上需要以编程方式注册接收器， list 声明不适用于 Intent.ACTION_SCREEN_OFF 和 Intent.ACTION_SCREEN_ON，在服务 onCreate 中注册接收器实例()，在onDestroy()

注销

 IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
 filter.addAction(Intent.ACTION_SCREEN_OFF);
 receiver = new EventsReciever();
 registerReceiver(receiver, filter);