如何在屏幕醒来或按下锁定按钮时启动相机

我正在开发一款应用程序，可以将其假定为手机锁定应用程序。我的应用程序最初设置了由用户设置的锁定图像，然后开始在服务中运行。我只是想启动相机，当我唤醒我的屏幕时点击一张照片。我一周以来一直在寻找这个。请帮助。我附上我的代码以及这个问题。如何在屏幕醒来或按下锁定按钮时启动相机

MainActivity.java

public class MainActivity extends AppCompatActivity { 

    private Button btncam; 
    private ImageView imgcam; 
    static final int REQUEST_IMAGE_CAPTURE=1; 
    private Uri imguri; 
    private File f2; 
    private Intent intent; 

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

     btncam=(Button) findViewById(R.id.btncam); 
     imgcam=(ImageView) findViewById(R.id.imgcam); 

     if(!hasCamera()) 
     { 
      btncam.setEnabled(false); 
     } 

     f2=getOutputMediaFile(); 
     imguri=FileProvider.getUriForFile(MainActivity.this,BuildConfig.APPLICATION_ID + ".provider", f2); 

     if(BitmapFactory.decodeFile(imguri.getPath())!=null) 
     { 
      startService(); 
     } 
     else 
     { 
      Toast.makeText(this,"no lock set....please set a lock image",Toast.LENGTH_SHORT).show(); 
     } 
     btncam.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       intent=new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 
       intent.putExtra(MediaStore.EXTRA_OUTPUT,imguri); 
       startActivityForResult(intent,REQUEST_IMAGE_CAPTURE); 
      } 
     }); 
    } 

    File getOutputMediaFile() { 
     File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
       Environment.DIRECTORY_PICTURES), "CameraDemo"); 

     if (!mediaStorageDir.exists()) { 
      if (!mediaStorageDir.mkdirs()) { 
       return null; 
      } 
     } 
     return new File(mediaStorageDir.getPath() + File.separator + 
       "IMG.png"); 

    } 

    private boolean hasCamera() 
    { 
     return getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_ANY); 
    } 

    public void startService() 
    { 
     Intent intent=new Intent(this,MyService.class); 
     startService(intent); 
    } 

    public void stopService() 
    { 
     Intent intent=new Intent(this,MyService.class); 
     stopService(intent); 
    } 

    @Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
     if(requestCode==REQUEST_IMAGE_CAPTURE && resultCode==RESULT_OK) 
     { 
      Bitmap b=BitmapFactory.decodeFile(imguri.getPath()); 
      imgcam.setImageBitmap(b); 
      Toast.makeText(this,"Lock saved",Toast.LENGTH_SHORT).show(); 
      startService(); 
     } 
    } 
}

Myservice.java

public class MyService extends Service { 

    @Override 
    public void onCreate() { 
     super.onCreate(); 
     IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON); 
     filter.addAction(Intent.ACTION_SCREEN_OFF); 
     BroadcastReceiver mReceiver = new LockReceiver(); 
     registerReceiver(mReceiver, filter); 
    } 

    @Override 
    public int onStartCommand(Intent intent, int flags, int startId) { 
     Toast.makeText(this, "Service started", Toast.LENGTH_SHORT).show(); 
     KeyguardManager myKM = (KeyguardManager)getSystemService(Context.KEYGUARD_SERVICE); 
     boolean isPhoneLocked = myKM.inKeyguardRestrictedInputMode(); 
     if(isPhoneLocked==true) 
     { 
      Log.v("result","phone is locked"); 
      //Toast.makeText(MyService.this,"Phone is locked",Toast.LENGTH_SHORT).show(); 
      boolean screenOn = intent.getBooleanExtra("screen_state", false); 
      if (!screenOn) { 
       // YOUR CODE 
       Log.v("ans","phone wakes up"); 
      } else { 
       // YOUR CODE 
       Log.v("ans","phone sleeping"); 
      } 
     } 
     else 
     { 
      Log.v("result","phone is unlocked"); 
      //Toast.makeText(MyService.this,"Phone is not locked",Toast.LENGTH_SHORT).show(); 
     } 
     return START_STICKY; 
    } 

    @Override 
    public void onDestroy() { 
     Toast.makeText(this, "Service stopped", Toast.LENGTH_SHORT).show(); 
    } 

    @Override 
    public void onTaskRemoved(Intent rootIntent) { 
     super.onTaskRemoved(rootIntent); 
     Intent restartServiceTask = new Intent(getApplicationContext(),this.getClass()); 
     restartServiceTask.setPackage(getPackageName()); 
     PendingIntent restartPendingIntent =PendingIntent.getService(getApplicationContext(), 1,restartServiceTask, PendingIntent.FLAG_ONE_SHOT); 
     AlarmManager myAlarmService = (AlarmManager) getApplicationContext().getSystemService(Context.ALARM_SERVICE); 
     myAlarmService.set(AlarmManager.ELAPSED_REALTIME, SystemClock.elapsedRealtime() +10, restartPendingIntent); 
     super.onTaskRemoved(rootIntent); 
    } 

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

LockReceiver.java

public class LockReceiver extends BroadcastReceiver { 

    private boolean screenOff; 

    @Override 
    public void onReceive(Context context, Intent intent) { 
     if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) { 
      screenOff = true; 
     } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) { 
      screenOff = false; 
     } 
     Intent i = new Intent(context,MyService.class); 
     i.putExtra("screen_state", screenOff); 
     context.startService(i); 
    } 
}

activity_main.xml中

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" 
    tools:context="com.example.user.objunlck.MainActivity"> 

    <Button 
     android:text="set lock" 
     android:layout_marginRight="75dp" 
     android:layout_marginLeft="75dp" 
     android:id="@+id/btncam" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" /> 

    <ImageView 
     android:id="@+id/imgcam" 
     android:layout_marginTop="25dp" 
     android:layout_gravity="center_horizontal" 
     android:layout_width="300dp" 
     android:layout_height="300dp" /> 

    </LinearLayout>

provider_paths.xml

<?xml version="1.0" encoding="utf-8"?> 
<paths xmlns:android="http://schemas.android.com/apk/res/android"> 
    <external-path name="/storage/emulated/0" path="."/> 
</paths>

的Manifest.xml

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

    <uses-feature 
     android:name="android.hardware.camera2" 
     android:required="true" /> 
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> 
    <application 
     android:allowBackup="true" 
     android:icon="@mipmap/ic_launcher" 
     android:label="@string/app_name" 
     android:roundIcon="@mipmap/ic_launcher_round" 
     android:supportsRtl="true" 
     android:theme="@style/AppTheme"> 
     <activity android:name=".MainActivity"> 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 
       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 
     <provider 
      android:name="android.support.v4.content.FileProvider" 
      android:authorities="${applicationId}.provider" 
      android:exported="false" 
      android:grantUriPermissions="true"> 
      <meta-data 
       android:name="android.support.FILE_PROVIDER_PATHS" 
       android:resource="@xml/provider_paths" /> 
     </provider> 

     <service android:name=".MyService" 
      android:exported="false" 
      android:stopWithTask="false" 
      android:enabled="true"> 
     </service> 
    </application> 
</manifest>

感谢...请大家帮忙

来源

2017-07-14 Sumit Solanki

我假设你没有得到正确的ON/OFF事件。

该两个动作为屏幕和关闭是：

android.intent.action.SCREEN_OFF 
android.intent.action.SCREEN_ON

下面是接收器的代码：

public class ScreenStateReciever extends BroadcastReceiver { 

    @Override 
    public void onReceive(Context context, Intent intent) { 
     if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) { 
      Log.i("TAG","Screen went OFF"); 

     } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) { 
      Log.i("TAG","Screen went ON"); 
      // start your camera activity 
      Intent intent = new Intent(this, MainActivity.class); 
      startActivity(intent); 
     } 
    } 
}

创建服务类接收器的对象：

ScreenStateReceiver mScreenStateReceiver = new ScreenStateReceiver();

为接收者创建一个IntentFilter来监听事件（将其写入Service的onStartCommand（））：

IntentFilter screenStateFilter = new IntentFilter(); 
screenStateFilter.addAction(Intent.ACTION_SCREEN_ON); 
screenStateFilter.addAction(Intent.ACTION_SCREEN_OFF); 
registerReceiver(mScreenStateReceiver, screenStateFilter);

注销onDestroy（）和onTerminated（）服务中的接收器。

unregisterReceiver(mScreenStateReceiver);

要保存图像的任何文件夹中，使用getExternalStorageDirectory（）在getOutputMediaFile（）方法。 getExternalStoragePublicDirectory（String type）将返回该类型文件夹的根路径，在这里是图片。你可以阅读更多关于它here。

File getOutputMediaFile() { 
     File mediaStorageDir = new File(Environment.getExternalStorageDirectory(), "CameraDemo"); 

     if (!mediaStorageDir.exists()) { 
      if (!mediaStorageDir.mkdirs()) { 
       return null; 
      } 
     } 
     return new File(mediaStorageDir.getPath() + File.separator + 
       "IMG.png"); 

    }

来源

2017-07-14 08:45:27 deepankar

是的，我是越来越开关事件also.Now我是最初能够打开相机时的画面被ACTION_IMAGE_CAPTURE_SECURE，这是我的手机的默认摄像头锁定屏幕。但这里的问题是，我想通过这个相机存储在任何想要的文件夹点击图像，但图像进入DCIM文件夹。请help.I附加更新的服务类代码here.Rest一切都与以前相同帖子... –

public class MyService extends Service { 



@Override 
public void onCreate() { 
    super.onCreate(); 
    IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON); 
    filter.addAction(Intent.ACTION_SCREEN_OFF); 
    BroadcastReceiver mReceiver = new LockReceiver(); 
    registerReceiver(mReceiver, filter); 
} 

@Override 
public int onStartCommand(Intent intent, int flags, int startId) { 
    Toast.makeText(this, "Service started", Toast.LENGTH_SHORT).show(); 
    KeyguardManager myKM = (KeyguardManager)getSystemService(Context.KEYGUARD_SERVICE); 
    boolean isPhoneLocked = myKM.inKeyguardRestrictedInputMode(); 
    if(isPhoneLocked==true) 
    { 
     Log.v("result","phone is locked"); 
     //Toast.makeText(MyService.this,"Phone is locked",Toast.LENGTH_SHORT).show(); 
     boolean screenOn = intent.getBooleanExtra("screen_state", false); 
     if (!screenOn) { 
      // YOUR CODE 
      Log.v("ans","phone wakes up"); 
      Intent in=new Intent(MediaStore.ACTION_IMAGE_CAPTURE_SECURE); 
      startActivity(in); 
      Log.v("act","camera opened for lock comparing"); 
     } else { 
      // YOUR CODE 
      Log.v("ans","phone sleeping"); 
     } 
    } 
    else 
    { 
     Log.v("result","phone is unlocked"); 
     //Toast.makeText(MyService.this,"Phone is not locked",Toast.LENGTH_SHORT).show(); 
    } 
    return START_STICKY; 
} 

@Override 
public void onDestroy() { 
    Toast.makeText(this, "Service stopped", Toast.LENGTH_SHORT).show(); 
} 

@Override 
public void onTaskRemoved(Intent rootIntent) { 
    super.onTaskRemoved(rootIntent); 
    Intent restartServiceTask = new Intent(getApplicationContext(),this.getClass()); 
    restartServiceTask.setPackage(getPackageName()); 
    PendingIntent restartPendingIntent =PendingIntent.getService(getApplicationContext(), 1,restartServiceTask, PendingIntent.FLAG_ONE_SHOT); 
    AlarmManager myAlarmService = (AlarmManager) getApplicationContext().getSystemService(Context.ALARM_SERVICE); 
    myAlarmService.set(AlarmManager.ELAPSED_REALTIME, SystemClock.elapsedRealtime() +10, restartPendingIntent); 
    super.onTaskRemoved(rootIntent); 
} 

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

}

来源

2017-07-16 23:23:51

如何在屏幕醒来或按下锁定按钮时启动相机

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