Question

我试图从之前的ReportActivity中捕获的SD卡中获取图像。

这是我在ReportActivity中将图像保存到SD卡目录的代码。

private void SaveIamge(Bitmap finalBitmap) {

    String root = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES).toString();
    File myDir = new File(root + "/saved_images");
    myDir.mkdirs();
    Random generator = new Random();
    int n = 10000;
    n = generator.nextInt(n);
    String fname = "Image-" + n + ".jpg";
    currentPicLoc=root+"/saved_images"+fname;
    File file = new File(myDir, fname);
    if (file.exists())
        file.delete();
    try {
        FileOutputStream out = new FileOutputStream(file);
        finalBitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
        out.flush();
        out.close();
    }
    catch (Exception e) {
        e.printStackTrace();
    }


    // Tell the media scanner about the new file so that it is
    // immediately available to the user.
    MediaScannerConnection.scanFile(this, new String[]{file.toString()}, null,
            new MediaScannerConnection.OnScanCompletedListener() {
                public void onScanCompleted(String path, Uri uri) {
                    Log.i("ExternalStorage", "Scanned " + path + ":");
                    Log.i("ExternalStorage", "-> uri=" + uri);
                }
            });
}

然后使用OnActivityResult拍摄照片。

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

    if(requestCode == CAMERA_REQUEST_CODE && resultCode == Activity.RESULT_OK) {

        if (data.hasExtra("data")){
            Bitmap thumbnail =(Bitmap)data.getExtras().get("data");
             buttonLoadImage.setImageBitmap(thumbnail);

            SaveIamge(thumbnail);



        }else{
            Toast.makeText(getApplicationContext(), "No image", Toast.LENGTH_LONG);
        }

    }

}

按钮转到下一页。

public void onSubmit(View view) {




    Toast.makeText(getApplicationContext(), currentPicLoc, Toast.LENGTH_LONG).show();

    Intent intent = new Intent(this,Testing.class);
    intent.putExtra("imageURL",currentPicLoc);
    startActivity(intent);


}

然后，我显示图像的图像和URL。

下一页的onCreate方法。

    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_testing);

    Bundle extras = getIntent().getExtras();

    String imageURL = extras.getString("imageURL");

    TextView tvMessage = (TextView) findViewById(R.id.tvMessage);

    tvMessage.setText(imageURL);




    ImageView imageView = (ImageView) findViewById(R.id.imageTesting);

    Bitmap thumbnail = (BitmapFactory.decodeFile(imageURL));

    imageView.setImageBitmap(thumbnail);

/ *

    File file = new File (imageURL);

    imageView.setImageURI(Uri.fromFile(file));

* /

然而结果是我无法加载图像。但是会显示图像的路径（String）。

（我无法在此处显示图片，因为我的声誉低于10）

请帮忙！

Answer 1

借助Android 4.4（KitKat），谷歌阻止了应用程序写入SD卡，除非是非常具体的沙盒位置。

Answer 2

尝试这种方式：

File imgFile = new  File(imageURL);

if(imgFile.exists()){

    Bitmap myBitmap = BitmapFactory.decodeFile(imgFile.getAbsolutePath());

    ImageView imageView = (ImageView) findViewById(R.id.imageTesting);

    imageView.setImageBitmap(myBitmap);

}

Android KitKat：如何从SD卡（路径）加载图像？

2 个答案: