启动 Intent 时相机在 Android 10 上崩溃

Question

我正在尝试将拍照功能添加到我的应用中，这应该相当简单，但是由于某种原因我在 android 10 上遇到了问题。

我遵循https://developer.android.com/training/camera/photobasics 的实现细节（到目前为止，我只实现了应该启动相机应用并返回缩略图位图的基本功能）

这一切都适用于较旧的模拟设备，但是当我在我的物理 Google Pixel 和模拟 Pixel 2（都运行 Android 10）上测试它时，我在调用 startActivity 后崩溃了：

btnCam.setOnClickListener(v -> {
    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    if (takePictureIntent.resolveActivity(getActivity().getPackageManager()) != null) {
        startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
    }
});

问题是，崩溃的不是我的应用程序，而是相机应用程序。如果我在崩溃后查看 logcat，我会收到以下消息：

2020-02-02 17:11:29.059 15592-15592/? E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.google.android.GoogleCamera, PID: 15592
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.google.android.GoogleCamera/com.google.android.apps.camera.legacy.app.activity.CaptureActivity}: java.lang.NullPointerException: Attempt to get length of null array
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3270)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)
        at android.os.Handler.dispatchMessage(Handler.java:107)
        at android.os.Looper.loop(Looper.java:214)
        at android.app.ActivityThread.main(ActivityThread.java:7356)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
     Caused by: java.lang.NullPointerException: Attempt to get length of null array
        at com.google.android.apps.camera.legacy.app.activity.CaptureActivity.onCreate(PG:12)
        at android.app.Activity.performCreate(Activity.java:7802)
        at android.app.Activity.performCreate(Activity.java:7791)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1306)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3245)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409) 
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83) 
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) 
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016) 
        at android.os.Handler.dispatchMessage(Handler.java:107) 
        at android.os.Looper.loop(Looper.java:214) 
        at android.app.ActivityThread.main(ActivityThread.java:7356) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930) 

逻辑上考虑到它与java.lang.NullPointerException: Attempt to get length of null array 崩溃，我想它期待某种我没有提供的输入形式，但是我没有发现任何提及必须提供任何额外参数（我知道你可以指定可选参数指定将生成的照片写入的位置，但没有人说这是必需的）

有人知道这个问题以及如何在 Android 10 上解决它吗？

谢谢

Answer 1

根据another post，这是相机应用程序中的一个错误，最近已更正。当您使用相机应用拍照时，您的应用无需请求使用相机的权限。

但是，如果您需要在错误修复推出之前让您的应用在 API 29 模拟器或设备上运行，您可以在 AndroidManifest.xml 中添加<uses-permission> 以获得任何类型的权限（甚至是虚假权限） ：

<manifest ...>
   <uses-permission android:name="BLAH" />
   ...

</manifest>

Answer 2

首先，您必须检查相机权限，还要在清单文件中添加相机权限。检查代码如下

1. 在AndroidManifest.xml文件中添加

2. 检查相机权限。

private static final int CAMERA_REQUEST = 100;  
if(ContextCompat.checkSelfPermission(this,Manifest.permission.CAMERA)!=PackageManager.PERMISSION_GRANTED){
      ActivityCompat.requestPermissions(this,
      newString[]{
        Manifest.permission.CAMERA
      },
      MY_CAMERA_PERMISSION_CODE);
    }else{
        Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
            startActivityForResult(cameraIntent, CAMERA_REQUEST);
    }

1.     public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
           super.onRequestPermissionsResult(requestCode, permissions, grantResults);
   
           switch (requestCode) {
   
               case MY_CAMERA_PERMISSION_CODE: {
                   if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                       showPictureDialog();
                   } else {
                       Snackbar snackbar = Snackbar
                               .make(relativeLayout, "Please Allow Permission", Snackbar.LENGTH_LONG)
                               .setAction("Setting", new View.OnClickListener() {
                                   @Override
                                   public void onClick(View view) {
                                       Intent intent = new Intent();
                                       intent.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
                                       Uri uri = Uri.fromParts("package", getPackageName(), null);
                                       intent.setData(uri);
                                       startActivity(intent);
                                   }
                               });
                       snackbar.show();
                   }
               }
           }
       }
   

4.

     @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        callbackManager.onActivityResult(requestCode, resultCode, data);

         if (requestCode == CAMERA_REQUEST) {
            Bitmap thumbnail = (Bitmap) data.getExtras().get("data");
            circleImageView.setImageBitmap(thumbnail);
            saveImage(thumbnail);
            Toast.makeText(SignUpActivity.this, "Image Saved!", Toast.LENGTH_SHORT).show();
        }
    }

5. 将图像保存到存储中

    public String saveImage(Bitmap myBitmap) {

        ByteArrayOutputStream bytes = new ByteArrayOutputStream();
        myBitmap.compress(Bitmap.CompressFormat.JPEG, 90, bytes);
        File wallpaperDirectory = new File(Environment.getExternalStorageDirectory() + IMAGE_DIRECTORY);
        // have the object build the directory structure, if needed.
        if (!wallpaperDirectory.exists()) {
            wallpaperDirectory.mkdirs();
        }

        try {
            File f = new File(wallpaperDirectory, Calendar.getInstance()
                    .getTimeInMillis() + ".jpg");
            f.createNewFile();
            FileOutputStream fo = new FileOutputStream(f);
            fo.write(bytes.toByteArray());
            MediaScannerConnection.scanFile(this,
                    new String[]{f.getPath()},
                    new String[]{"image/jpeg"}, null);
            fo.close();
            Log.d("TAG", "File Saved::--->" + f.getAbsolutePath());

            return f.getAbsolutePath();
        } catch (IOException e1) {
            e1.printStackTrace();
        }
        return "";
    }