Question

我用标准相机拍照：

  val takePicture = Intent(MediaStore.ACTION_IMAGE_CAPTURE)
  startActivityForResult(takePicture, TAKE_PICTURE)

接收结果：

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent) {       
    if (resultCode != Activity.RESULT_CANCELED) {
        if (requestCode == TAKE_PICTURE && resultCode == RESULT_OK && data != null) {
            presenter!!.takeImg(this, data)
        }
    }    
}

以下是函数takeimg的代码：

fun takeImg(context: Context, data: Intent) {       
    val imageName = CameraCommon.getFileNamePhotoReg(mImageType)        
    val bitmap = data.extras!!.get("data") as Bitmap
    val imageFile = CameraCommon.createImageByBitmap(context, imageName, bitmap, typePNG)
    setImg(imageFile.absolutePath)    
}

在某些设备上拍照后发生以下错误：

04-23 17:53:40.153 17393-17393/jp.osaka.mozuyan E/AndroidRuntime: FATAL EXCEPTION: main
                                                                  Process: jp.osaka.mozuyan, PID: 17393
                                                                  java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=6352, result=-1, data=Intent { dat=content://media/external/images/media/100582 typ= flg=0x1 }} to activity {jp.osaka.mozuyan/jp.osaka.mozuyan.photoreg.PhotoRegActivity}: kotlin.KotlinNullPointerException
                                                                      at android.app.ActivityThread.deliverResults(ActivityThread.java:3699)
                                                                      at android.app.ActivityThread.handleSendResult(ActivityThread.java:3742)
                                                                      at android.app.ActivityThread.access$1400(ActivityThread.java:150)
                                                                      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1393)
                                                                      at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                      at android.os.Looper.loop(Looper.java:148)
                                                                      at android.app.ActivityThread.main(ActivityThread.java:5417)
                                                                      at java.lang.reflect.Method.invoke(Native Method)
                                                                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:764)
                                                                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
                                                                   Caused by: kotlin.KotlinNullPointerException
                                                                      at jp.osaka.mozuyan.photoreg.PhotoRegPresenter.takeImg(PhotoRegPresenter.kt:46)
                                                                      at jp.osaka.mozuyan.photoreg.PhotoRegActivity.onActivityResult(PhotoRegActivity.kt:107)
                                                                      at android.app.Activity.dispatchActivityResult(Activity.java:6490)
                                                                      at android.app.ActivityThread.deliverResults(ActivityThread.java:3695)

第46行：val bitmap = data.extras!!.get("data") as Bitmap和 data.extras为空

为什么extra是null？如何将数据保存到图像文件。谢谢。

Answer 1

使用此代码将图像存储到SD卡中然后只需获取图像并显示图像视图。如果您希望也可以转换为位图

      if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
            //   takePictureButton.setEnabled(false);


          ActivityCompat.requestPermissions(this, new String[] 
    {  
     Manifest.permission.CAMERA,  
     Manifest.permission.WRITE_EXTERNAL_STORAGE
    ,Manifest.permission.READ_EXTERNAL_ST ORAGE}, 0);
    Toast.makeText(getApplicationContext(),"After permition Restart 
    App",Toast.LENGTH_SHORT).show();

    }else {

    takePictureButton.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View v) {
              takePicture(v);
          }
      });
    }}

    public void takePicture(View view) {
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        file = Uri.fromFile(getOutputMediaFile());
        intent.putExtra(MediaStore.EXTRA_OUTPUT, file);

        startActivityForResult(intent, 100);
    }
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == 100) {
            if (resultCode == RESULT_OK) {
          imageView.setImageURI(file);
            }
        }
    }
    private static File getOutputMediaFile(){
        File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
                Environment.DIRECTORY_PICTURES), "CameraDemo");

        if (!mediaStorageDir.exists()){
            if (!mediaStorageDir.mkdirs()){
                return null;
            }
        }

        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
//any path 
        return new File(mediaStorageDir.getPath() + File.separator +
                "IMG_"+ timeStamp + ".jpg");
    }

为什么Camera return extra为null？

1 个答案: