java - 相机拍摄的图像不想显示在 ImageView 中

Question

我有一个 ImageView，我希望能够从中加载图像:

1. 图库 - 工作正常

2. 相机 - 不加载任何东西

使用这两种不同操作时的日志非常相似，除了相机操作显示到最后:

• 10-21 23:24:18.304: D/android.widget.GridLayout(4447): 水平约束条件:x6 - x0 > 720，x5 - x0 > 720，x5 - x4 < 20，x4 - x3 <142、x3 - x2 < 70、x2 - x1 < 32、x1 - x0 < 138不一致；永久移除:x5 - x4 < 20。
• 10-21 23:24:18.324: D/android.widget.GridLayout(4447): 垂直约束:y1 - y0 > 468，y2 - y1 > 30，y3 - y2 > 120，y3 - y0 >1140, y4 - y3 > 612, y4 - y0 < 1140, y3 - y2 < 120, y2 - y1 < 30不一致；永久删除:y4 - y0 < 1140，y3 - y2 < 120。

我有一种感觉，这是为什么图像没有显示的解释。该应用程序没有段错误或任何东西，从用户界面的角度来看没有任何反应。

代码(由相机 Action 和画廊 Action 共享)是:

protected void onActivityResult(int requestCode, int resultCode, Intent data){
if(resultCode == Activity.RESULT_OK) {
    Uri uri = data.getData();

    if ((requestCode == SELECT_PICTURE) || (requestCode == PICTURE_RESULT)) {
        Uri selectedImageUri = data.getData();
        selectedImagePath = getRealPathFromURI(selectedImageUri);
        mImageView = (ImageView) findViewById(R.id.imageView1);
        int x = mImageView.getWidth();
        int y = mImageView.getHeight();
        if (x == 0 || y == 0) {
            Display d = getWindowManager().getDefaultDisplay();
            x = d.getWidth();
            y = d.getHeight();
        }
        try {
            BitmapFactory.Options opts = new BitmapFactory.Options(); 
            opts.inJustDecodeBounds = true;
            BitmapFactory.decodeFile(selectedImagePath, opts);
            // Calculate inSampleSize
            opts.inSampleSize = calculateInSampleSize(opts, x, y);                  
            // Decode bitmap with inSampleSize set
            opts.inJustDecodeBounds = false;
            mPicture = BitmapFactory.decodeFile(selectedImagePath, opts);
            mPicture.recycle(); //otherwise multiple calls segfault
            // create a matrix object
            Matrix matrix = new Matrix();
            matrix.postRotate(90); // clockwise by 90 degrees
            // create a new bitmap from the original using the matrix to transform the result
            Bitmap rotatedBitmap = Bitmap.createBitmap(mPicture, 0, 0, mPicture.getWidth(), mPicture.getHeight(), matrix, true);

            //set image view
            mImageView.setImageBitmap(rotatedBitmap);
        } catch (Exception e) {                 
            System.out.println("Bitmap could not be decoded." + e.getMessage());
        }
    }

路径正确，位图不为空，一切看起来都正常，但图像不显示。感谢您的帮助!

Answer 1

我认为错误是在创建文件时

下面这段代码对我有用

File photofile = new File(Environment
                    .getExternalStorageDirectory(),"sample"
                    + System.currentTimeMillis() + ".jpg");
            photFileUri = Uri.fromFile(photofile);
            photoPath = photofile.getAbsolutePath();
            Log.v("camera photo path is    ","          "+photoPath);
            Intent cameraIntent = new Intent(
                    android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
            cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, photFileUri);
            cameraIntent.putExtra("return-data", true);
            startActivityForResult(cameraIntent,1);

在 OnActivityForResult() 方法中，您将获得路径

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {

    switch (requestCode) {
    case 1:
                //here u can use **photoPath** to display image
}