0

我使用 Intent 和 ACTION_IMAGE_CAPTURE 使用相机拍照，我成功获取了照片的 uri，但是当我使用此 uri 获取路径时，发生了异常。当我去画廊时，我没有看到照片。我重新启动手机，然后我在图库中看到了这张照片。一旦我完成意图，谁能告诉我如何获取路径或让位图进入画廊？

我的代码：

 Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

                    Date today = new Date();

                    fileName = Integer.toString(today.getYear()) + Integer.toString(today.getMonth()) + Integer.toString(today.getDay()) +
                            Integer.toString(today.getHours()) + Integer.toString(today.getMinutes()) + Integer.toString(today.getSeconds());

                    File out = new File(Environment.getExternalStorageDirectory(), fileName + ".jpg");
                    tempUri = Uri.fromFile(out);
                    intent.putExtra(MediaStore.EXTRA_OUTPUT, tempUri);
                    startActivityForResult(intent, TAKEPHOTO);
                    break;

并在 onActivityResult

public void onActivityResult(int requestCode, int resultCode, Intent data)
{
    if (requestCode == COMPLETE)
    {
        if (data != null)
        {
            Uri uri = data.getData();
            if (uri != null)
            {
                    uris[currentIndex] = uri;
                    setBitmapFromUri();
            }
        }
    }
    else if (requestCode == TAKEPHOTO)
    {
        uris[currentIndex] = tempUri;
        setBitmapFromUri();
    }

    super.onActivityResult(requestCode, resultCode, data);
}

这是 setBitmapFromUri：

private void setBitmapFromUri()
{
    Uri uri = uris[currentIndex];

    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inSampleSize = 3;
    try
    {
        String path = getAbsoluteImagePath(uri);

        ExifInterface exif = new ExifInterface(path);

        int tag = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, -1);

        int degree = 0;
        if (tag == ExifInterface.ORIENTATION_ROTATE_90)
        {
            degree = 90;
        }
        else if (tag == ExifInterface.ORIENTATION_ROTATE_180)
        {
            degree = 180;
        }
        else if (tag == ExifInterface.ORIENTATION_ROTATE_270)
        {
            degree = 270;
        }

        Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(uri), null, options);
        Matrix matrix = new Matrix();
        matrix.setScale (2 * getWindowManager().getDefaultDisplay().getWidth() / 3 / bitmap.getWidth(), 2 * getWindowManager().getDefaultDisplay().getHeight() / 3 / bitmap.getHeight());
        matrix.setRotate(degree);

        bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);

        imageViews.get(currentIndex).setImageBitmap(bitmap);
    } catch (IOException e)
    {
        e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
    }


}

这是一个例外：

05-18 10:38:20.645: ERROR/AndroidRuntime(3342): FATAL EXCEPTION: main
    java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=null} to activity {com.Trine.HideAndSeek/com.Trine.HideAndSeek.UploadHints}: java.lang.NullPointerException
    at android.app.ActivityThread.deliverResults(ActivityThread.java:2653)
    at android.app.ActivityThread.handleSendResult(ActivityThread.java:2695)
    at android.app.ActivityThread.access$2000(ActivityThread.java:123)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:969)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:130)
    at android.app.ActivityThread.main(ActivityThread.java:3835)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:507)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:864)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:622)
    at dalvik.system.NativeStart.main(Native Method)
    Caused by: java.lang.NullPointerException
    at com.Trine.HideAndSeek.UploadHints.getAbsoluteImagePath(UploadHints.java:324)
    at com.Trine.HideAndSeek.UploadHints.setBitmapFromUri(UploadHints.java:140)
    at com.Trine.HideAndSeek.UploadHints.onActivityResult(UploadHints.java:196)
    at android.app.Activity.dispatchActivityResult(Activity.java:3908)
    at android.app.ActivityThread.deliverResults(ActivityThread.java:2649)
4

2 回答 2

1

我用它来从图像的 Uri 获取真实的文件路径..

//----------------------------------------
/**
 * This method is used to get real path of file from from uri
 * 
 * @param contentUri
 * @return String
 */
//----------------------------------------
public String getRealPathFromURI(Uri contentUri)
{
    try
    {
        String[] proj = {MediaStore.Images.Media.DATA};
        Cursor cursor = managedQuery(contentUri, proj, null, null, null);
        int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        cursor.moveToFirst();
        return cursor.getString(column_index);
    }
    catch (Exception e)
    {
        return contentUri.getPath();
    }
}

此外，要在图库中查看您捕获的图像，您必须从您的应用程序启动 android 媒体扫描仪。

在捕获图像后尝试这条线..

context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://" + Environment.getExternalStorageDirectory())));
于 2012-05-18T08:21:42.767 回答
1

试试这个，它对我有用：

Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

mImageCaptureUri = Uri.fromFile(new File(Environment.getExternalStorageDirectory(),"temp_file_" + String.valueOf(System.currentTimeMillis()) + ".jpg"));

intent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, mImageCaptureUri);

try 
{
    intent.putExtra("return-data", true);
    startActivityForResult(intent, INTENT_FOR_IMG_PROCESSING);
} 
catch (ActivityNotFoundException e) 
{   
     e.printStackTrace();
}
于 2012-05-18T08:25:14.127 回答