android相机失败提供结果resultinfo

Question

好的，这显然是一个重复的问题，但在所有其他问题中我都没有找到可行的解决方案......

所以，我正在尝试用相机拍照并在 imageview 中显示此图像...现在，它是否有效或其他什么都不重要，所以我不处理这个...

这是我的代码：

运行相机：

b2.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick (View v) {
            Intent takePicture = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            if(takePicture.resolveActivity(getPackageManager()) != null) {
                File image = null;
                try {
                    image = createImageFile();
                } catch (IOException ex) {
                    finish();
                }
                if(image != null) {
                    takePicture.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(image));
                    startActivityForResult(takePicture, 1);
                }
            }
        }
    });

createImageFile方法：

private File createImageFile() throws IOException {
    String name = System.currentTimeMillis() / 1000 + "";
    File dir = getExternalFilesDir(null);
    File image = File.createTempFile(name, ".png", dir);
    path = "file:" + image.getAbsolutePath();
    return image;
}

和onActiviyResult 方法：

@Override
protected void onActivityResult (int requestCode, int resultCode, Intent data) {
    if(resultCode == RESULT_OK && requestCode == 1) {
        String path = data.getExtras().getString(MediaStore.EXTRA_OUTPUT);
        File f = new File(path);

        Bitmap b = Bitmap.createScaledBitmap(BitmapFactory.decodeFile(f.getAbsolutePath()), 50, 50, true);
        iv.setImageBitmap(b);
    } else {

    }
}

要提到的重要一点是，我的应用程序从未达到onActivityResult 方法，但在我拍照并单击保存以保存图片后卡在某个地方（此屏幕显示在拍摄图像后，这不是我实现的，但它就是它的方式在 Android 上）

这是我的日志：

04-08 14:57:37.230    5976-5976/hr.fer.dummyproj E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=null} to activity {hr.fer.dummyproj/hr.fer.dummyproj.MainActivity}: java.lang.NullPointerException
        at android.app.ActivityThread.deliverResults(ActivityThread.java:3500)
        at android.app.ActivityThread.handleSendResult(ActivityThread.java:3543)
        at android.app.ActivityThread.access$1200(ActivityThread.java:159)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1364)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:176)
        at android.app.ActivityThread.main(ActivityThread.java:5419)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:525)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)
        at dalvik.system.NativeStart.main(Native Method)
 Caused by: java.lang.NullPointerException
        at hr.fer.dummyproj.MainActivity.onActivityResult(MainActivity.java:84)
        at android.app.Activity.dispatchActivityResult(Activity.java:5563)
        at android.app.ActivityThread.deliverResults(ActivityThread.java:3496)
        at android.app.ActivityThread.handleSendResult(ActivityThread.java:3543)
        at android.app.ActivityThread.access$1200(ActivityThread.java:159)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1364)  
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:176)
        at android.app.ActivityThread.main(ActivityThread.java:5419)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:525)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)
        at dalvik.system.NativeStart.main(Native Method)

更新 所以，我发现问题出在哪里。如果将图片保存在文件中，看起来相机活动不会在 Intent 中返回任何内容。因此，在onResultActivity 中，数据为空。 为了让它工作，我保存了 Uri 并在 onResultActivity 中获取图片

Answer 1

这对我有用....

static final int REQUEST_IMAGE_CAPTURE = 1;
String mCurrentPhotoPath;
Button captureImageButton;
static ImageView imageCapturedView;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_take_image);
captureImageButton = (Button) findViewById(R.id.button);

OnClickListener captureImageListener = new OnClickListener() {

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        Intent captureImageIntent= new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

        if(captureImageIntent.resolveActivity(getPackageManager())!=null)
        {
            File photoFile=null;

            try{
                photoFile = createImageFile();

            }catch(IOException e){};

            if(photoFile != null)
            {

                captureImageIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(photoFile));
                startActivityForResult(captureImageIntent, REQUEST_IMAGE_CAPTURE);
            }

        }

    }
};

captureImageButton.setOnClickListener(captureImageListener);

}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
imageCapturedView = (ImageView)findViewById(R.id.ImageView);

if(requestCode==REQUEST_IMAGE_CAPTURE && resultCode==RESULT_OK)
{
    Bundle extras = data.getExtras();
    Bitmap imageBitmap= (Bitmap) extras.get("data");

    imageCapturedView.setImageBitmap(imageBitmap);
    galleryAddPic();
    setPic();
}
}

private File createImageFile() throws IOException
{

String TimeStamp = new SimpleDateFormat("yyyyMMDdd_HHmmss").format(new Date());
String ImageFile = "JPEG_" + TimeStamp + "_";
File StorageDir =   Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);

File image = File.createTempFile(ImageFile, ".jpg", StorageDir); 

mCurrentPhotoPath = image.getAbsolutePath();

return image;

}

private void galleryAddPic()
{
Intent mediaScan = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
File f= new File(mCurrentPhotoPath);
Uri contentUri = Uri.fromFile(f);
mediaScan.setData(contentUri);
this.sendBroadcast(mediaScan);

}


private void setPic() throws ArithmeticException{


int scaleFactor;
Bitmap bitmap;
// Get the dimensions of the View
int targetW = imageCapturedView.getWidth();
int targetH = imageCapturedView.getHeight();


// Get the dimensions of the bitmap
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
bmOptions.inJustDecodeBounds = true;
//bmOptions.inSampleSize = 4;
BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);
int photoW = bmOptions.outWidth;
int photoH = bmOptions.outHeight;

// Determine how much to scale down the image
    scaleFactor= Math.min(photoW/targetW, photoH/targetH);

// Decode the image file into a Bitmap sized to fill the View
bmOptions.inJustDecodeBounds = false;
bmOptions.inSampleSize = scaleFactor;
bmOptions.inPurgeable = true;



bitmap = BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);

Toast.makeText(getApplicationContext(), mCurrentPhotoPath, Toast.LENGTH_LONG).show();
imageCapturedView.setImageBitmap(bitmap);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.take_image, menu);
return true;
}