NullPointerExceptionが発生し、カメラビューアクティビティが起動したときに即座に終了します

Question

以下のアクティビティから電話JIAYU J3にインストールされたチュートリアルアプリを起動するたびに致命的な例外が発生します。必要なすべてのアクセス許可とAPIキーが追加されます。 Gradleは視覚的な不具合なく仕上げられます。この問題は、アプリがメイン（カメラ）アクティビティを起動し、約1秒間保持してクラッシュするという問題を解決します。

トレース：

10-13 15:44:55.881 10891-10891/es.esy.kkaun.procrastinant E/dalvikvm: Could not find class 'android.os.UserManager', referenced from method com.google.android.gms.common.l.k 

10-13 15:44:55.927 10891-10891/es.esy.kkaun.procrastinant E/dalvikvm: Could not find class 'android.app.AppOpsManager', referenced from method com.google.android.gms.c.aw.a 

10-13 15:44:57.240 10891-10891/es.esy.kkaun.procrastinant E/AndroidRuntime: FATAL EXCEPTION: main 
                     java.lang.NullPointerException 
                      at android.support.v4.a.a.a(Unknown Source) 
                      at es.esy.kkaun.procrastinant.c.a(Unknown Source) 
                      at com.google.android.gms.common.internal.r.a(Unknown Source) 
                      at com.google.android.gms.c.x.a(Unknown Source) 
                      at com.google.android.gms.c.v.g(Unknown Source) 
                      at com.google.android.gms.c.v.a(Unknown Source) 
                      at com.google.android.gms.c.z.a(Unknown Source) 
                      at com.google.android.gms.c.r.a(Unknown Source) 
                      at com.google.android.gms.common.internal.q$1.a(Unknown Source) 
                      at com.google.android.gms.common.internal.j$j.a(Unknown Source) 
                      at com.google.android.gms.common.internal.j$a.a(Unknown Source) 
                      at com.google.android.gms.common.internal.j$a.a(Unknown Source) 
                      at com.google.android.gms.common.internal.j$e.c(Unknown Source) 
                      at com.google.android.gms.common.internal.j$d.handleMessage(Unknown Source) 
                      at android.os.Handler.dispatchMessage(Handler.java:99) 
                      at android.os.Looper.loop(Looper.java:154) 
                      at android.app.ActivityThread.main(ActivityThread.java:4624) 
                      at java.lang.reflect.Method.invokeNative(Native Method) 
                      at java.lang.reflect.Method.invoke(Method.java:511) 
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:809) 
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:576) 
                      at dalvik.system.NativeStart.main(Native Method) 

Layout.xml：

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
android:orientation="vertical" > 

<SurfaceView 
    android:id="@+id/cameraview" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" /> 

<ImageView 
    android:id="@+id/icon" 
    android:layout_width="96dp" 
    android:layout_height="96dp" 
    android:src="@drawable/obj1" 
    android:visibility="invisible" 
    android:layout_centerVertical="true" 
    android:layout_centerHorizontal="true" /> 

<TextView 
    android:id="@+id/cameraTextView" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="Large Text" 
    android:layout_alignParentTop="true" 
    android:layout_alignParentStart="true" 
    android:layout_alignParentLeft="true" /> 

<Button 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="Map" 
    android:id="@+id/btnMap" 
    android:layout_marginBottom="23dp" 
    android:layout_alignParentBottom="true" 
    android:layout_centerHorizontal="true" /> 

<ImageView 
    android:layout_width="224dp" 
    android:layout_height="224dp" 
    android:id="@+id/imageView" 
    android:src="@drawable/reticle" 
    android:layout_centerVertical="true" 
    android:layout_centerHorizontal="true" /> 

</RelativeLayout> 

マニフェストファイル：

<uses-permission android:name="android.permission.CAMERA"/> 
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/> 
<uses-permission android:name="android.permission.INTERNET"/> 
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/> 
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/> 
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/> 

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> 
<uses-permission android:name="android.permission.READ_PHONE_STATE" /> 
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> 


<application 
    android:allowBackup="true" 
    android:icon="@mipmap/ic_launcher" 
    android:label="@string/app_name" 
    android:supportsRtl="true" 
    android:theme="@android:style/Theme.NoTitleBar" 
    android:name="android.support.multidex.MultiDexApplication"> 

    <activity 
     android:name="es.esy.kkaun.procrastinant.CameraViewActivity" 
     android:label="@string/activity_camera_view"> 
     <intent-filter> 
      <action android:name="android.intent.action.MAIN" /> 

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

    <activity android:name="es.esy.kkaun.procrastinant.MapsActivity"> 
     <meta-data 
      android:name="android.support.PARENT_ACTIVITY" 
      android:value="es.esy.kkaun.procrastinant.CameraViewActivity" /> 
    </activity> 

    <meta-data 
     android:name="com.google.android.maps.v2.API_KEY" 
     android:value="***api key added***" /> 

    <meta-data 
     android:name="com.google.android.gms.version" 
     android:value="@integer/google_play_services_version"/> 


</application> 

Butchedアクティビティのライフサイクルコード：

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout. activity_camera_view); 
    setRequestedOrientation(ActivityInfo. SCREEN_ORIENTATION_PORTRAIT); 

    setupListeners(); 
    setupLayout(); 
    setAugmentedRealityPoint(); 
} 

@Override 
protected void onResume() { 
    super.onResume(); 
    myCurrentAzimuth.start(); 
    myCurrentLocation.start(); 
} 

@Override 
protected void onStop() { 
    myCurrentAzimuth.stop(); 
    myCurrentLocation.stop(); 
    super.onStop(); 
} 

そして最後に、完全なアクティビティコード：解決

public class CameraViewActivity extends Activity implements 
    SurfaceHolder.Callback, OnLocationChangedListener, OnAzimuthChangedListener, View.OnClickListener { 

private Camera mCamera; 
private SurfaceHolder mSurfaceHolder; 
private boolean isCameraviewOn = false ; 
private MObject mPoi; 

private double mAzimuthReal = 0 ; 
private double mAzimuthTeoretical = 0 ; 


private static final double DISTANCE_ACCURACY = 20 ; 
private static final double AZIMUTH_ACCURACY = 10 ; 

private double mMyLatitude = 0 ; 
private double mMyLongitude = 0 ; 


public static final double TARGET_LATITUDE = 27.590377 ; 
public static final double TARGET_LONGITUDE = 14.425153 ; 


private MyCurrentAzimuth myCurrentAzimuth; 
private MyCurrentLocation myCurrentLocation; 

TextView descriptionTextView; 
ImageView pointerIcon; 
Button btnMap; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout. activity_camera_view); 
    setRequestedOrientation(ActivityInfo. SCREEN_ORIENTATION_PORTRAIT); 

    setupListeners(); 
    setupLayout(); 
    setAugmentedRealityPoint(); 
} 


private void setAugmentedRealityPoint() { 
    mPoi = new MObject(
      getString(R.string. p_name), 
      TARGET_LATITUDE, TARGET_LONGITUDE 
    ); 
} 

public double calculateDistance() { 
    double dX = mPoi .getPoiLatitude() - mMyLatitude; 
    double dY = mPoi .getPoiLongtitude() - mMyLongitude; 

    double distance = (Math. sqrt(Math.pow (dX, 2) + Math.pow(dY, 2)) * 100000); 

    return distance; 
} 

public double calculateTeoreticalAzimuth() { 
    double dX = mPoi .getPoiLatitude() - mMyLatitude; 
    double dY = mPoi .getPoiLongtitude() - mMyLongitude ; 

    double phiAngle; 
    double tanPhi; 
    double azimuth = 0; 

    tanPhi = Math.abs (dY/dX); 
    phiAngle = Math.atan (tanPhi); 
    phiAngle = Math.toDegrees (phiAngle); 

    if (dX > 0 && dY > 0) { // I quater 
     return azimuth = phiAngle; 
    } else if (dX < 0 && dY > 0) { // II 
     return azimuth = 180 - phiAngle; 
    } else if (dX < 0 && dY < 0) { // III 
     return azimuth = 180 + phiAngle; 
    } else if (dX > 0 && dY < 0) { // IV 
     return azimuth = 360 - phiAngle; 
    } 

    return phiAngle; 
} 

private List<Double> calculateAzimuthAccuracy(double azimuth) { 
    double minAngle = azimuth - AZIMUTH_ACCURACY ; 
    double maxAngle = azimuth + AZIMUTH_ACCURACY ; 
    List<Double> minMax = new ArrayList<Double>(); 

    if (minAngle < 0) 
     minAngle += 360; 

    if (maxAngle >= 360) 
     maxAngle -= 360; 

    minMax.clear(); 
    minMax.add(minAngle); 
    minMax.add(maxAngle); 

    return minMax; 
} 

private boolean isBetween(double minAngle, double maxAngle, double azimuth) { 
    if (minAngle > maxAngle) { 
     if (isBetween(0, maxAngle, azimuth) && isBetween(minAngle, 360 , azimuth)) 
      return true ; 
    } else { 
     if (azimuth > minAngle && azimuth < maxAngle) 
      return true ; 
    } 
    return false; 
} 

private void updateDescription() { 

    long distance = (long) calculateDistance(); 
    int tAzimut = (int) mAzimuthTeoretical ; 
    int rAzimut = (int) mAzimuthReal ; 

    String text = mPoi.getPoiName() 
      + " location:" 
      + "\n latitude: " + TARGET_LATITUDE + " longitude: " + TARGET_LONGITUDE 
      + "\n Current location:" 
      + "\n Latitude: " + mMyLatitude  + " Longitude: " + mMyLongitude 
      + "\n " 
      + "\n Target azimuth: " + tAzimut 
      + " \n Current azimuth: " + rAzimut 
      + " \n Distance: " + distance; 

    descriptionTextView.setText(text); 
} 



public void onAzimuthChanged(float azimuthChangedFrom, float azimuthChangedTo) { 
    mAzimuthReal = azimuthChangedTo; 
    mAzimuthTeoretical = calculateTeoreticalAzimuth(); 
    int distance = (int) calculateDistance(); 

    pointerIcon = (ImageView) findViewById(R.id. icon); 

    Drawable myDrawable = getResources().getDrawable(R.drawable.obj1); 
    pointerIcon.setImageDrawable(myDrawable); 

    double minAngle = calculateAzimuthAccuracy(mAzimuthTeoretical).get(0); 
    double maxAngle = calculateAzimuthAccuracy(mAzimuthTeoretical).get(1); 

    if ((isBetween(minAngle, maxAngle, mAzimuthReal)) && distance <= DISTANCE_ACCURACY) { 
     pointerIcon.setVisibility(View. VISIBLE); 
    } else { 
     pointerIcon.setVisibility(View. INVISIBLE); 
    } 

    updateDescription(); 
} 

@Override 
public void onLocationChanged(Location location) { 

    mMyLatitude = location.getLatitude(); 
    mMyLongitude = location.getLongitude(); 
    mAzimuthTeoretical = calculateTeoreticalAzimuth(); 
    Toast.makeText (this , "latitude: "+location.getLatitude()+ " longitude: "+location.getLongitude(), Toast. LENGTH_SHORT).show(); 

    int distance = (int) calculateDistance(); 


    if (mAzimuthReal == 0){ 
     if (distance <= DISTANCE_ACCURACY) { 
      pointerIcon.setVisibility(View.VISIBLE); 
     } else { 
      pointerIcon.setVisibility(View.INVISIBLE); 
     } 
    } 

    updateDescription(); 
} 


@Override 
protected void onResume() { 
    super.onResume(); 
    myCurrentAzimuth.start(); 
    myCurrentLocation.start(); 
} 


@Override 
protected void onStop() { 
    myCurrentAzimuth.stop(); 
    myCurrentLocation.stop(); 
    super.onStop(); 
} 


private void setupListeners() { 
    myCurrentLocation = new MyCurrentLocation(this); 
    myCurrentLocation.buildGoogleApiClient(this); 
    myCurrentLocation.start(); 

    myCurrentAzimuth = new MyCurrentAzimuth(this, this); 
    myCurrentAzimuth.start(); 
} 

private void setupLayout() { 
    descriptionTextView = (TextView) findViewById(R.id.cameraTextView); 
    btnMap = (Button) findViewById(R.id. btnMap); 
    btnMap.setVisibility(View. VISIBLE); 
    btnMap.setOnClickListener(this); 
    getWindow().setFormat(PixelFormat. UNKNOWN); 
    SurfaceView surfaceView = (SurfaceView) findViewById(R.id.cameraview); 
    mSurfaceHolder = surfaceView.getHolder(); 
    mSurfaceHolder.addCallback(this); 
    mSurfaceHolder.setType(SurfaceHolder. SURFACE_TYPE_PUSH_BUFFERS); 
} 

@Override 
public void surfaceChanged(SurfaceHolder holder, int format, int width, 
          int height) { 
    if (isCameraviewOn) { 
     mCamera.stopPreview(); 
     isCameraviewOn = false ; 
    } 

    if (mCamera != null) { 
     try { 
      mCamera .setPreviewDisplay(mSurfaceHolder); 
      mCamera .startPreview(); 
      isCameraviewOn = true ; 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 
    } 
} 

@Override 
public void surfaceCreated(SurfaceHolder holder) { 
    mCamera = Camera. open(); 
    mCamera.setDisplayOrientation(90); 
} 

@Override 
public void surfaceDestroyed(SurfaceHolder holder) { 
    mCamera.stopPreview(); 
    mCamera.release(); 
    mCamera = null ; 
    isCameraviewOn = false ; 
} 

@Override 
public void onClick(View v) { 
    Intent intent = new Intent(this , MapsActivity. class); 
    startActivity(intent); 
} 
} 

Answer 1

問題：それは不向きターゲットSDK、APPCOMPATと遊ぶ・サービスをバージョンを取ることによって引き起こされたジャンプからのようです。