java - Android Studio : How to set an external file(photo from the camera) to an imageview

Question

不知道如何将 ImageView 设置为我刚刚用相机拍摄的图片。如果有某种方法可以同时显示多张捕获的图片，那就太好了。每当我单击该按钮时，就会出现之前拍摄的图像，然后打开相机，这是不对的。我希望 ImageView 为空白，我单击按钮，拍照，然后该照片显示在 ImageView 中。我认为这条线不合适，但我不确定如何/在哪里移动它。 mimageView.setImageURI(outputFileUri);

public class cameraclass extends Activity {
    int TAKE_PHOTO_CODE = 0;
    public static int count = 0;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.camera);
        final ImageView mimageView;
        mimageView = (ImageView) this.findViewById(R.id.image_from_camera);




        // Here, we are making a folder named picFolder to store
        // pics taken by the camera using this application.
        final String dir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES) + "/picFolder/";
        File newdir = new File(dir);
        newdir.mkdirs();

        Button capture = (Button) findViewById(R.id.take_image_from_camera);
        capture.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {

                // Here, the counter will be incremented each time, and the
                // picture taken by camera will be stored as 1.jpg,2.jpg
                // and likewise.
                count++;
                String file = dir+count+".jpg";
                File newfile = new File(file);
                try {
                    newfile.createNewFile();
                }
                catch (IOException e)
                {
                }

                //Uri outputFileUri = Uri.fromFile(newfile);
                Uri outputFileUri = FileProvider.getUriForFile(getApplicationContext() , "com.example.android.com220finalapp.provider", newfile);

                Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);

                startActivityForResult(cameraIntent, TAKE_PHOTO_CODE);
                mimageView.setImageURI(outputFileUri);

            }
        });
    }

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

        if (requestCode == TAKE_PHOTO_CODE && resultCode == RESULT_OK) {
            Log.d("CameraDemo", "Pic saved");

        }
    }
}

Answer 1

I believe that this line is out of place, but i'm unsure as to how/ where to move it.

startActivityForResult() 是异步的。该方法返回时，您的照片尚未拍摄。如果您收到 RESULT_OK 响应，则需要在 onActivityResult() 中将图像加载到 ImageView 中。

但是，虽然 setImageURI() 可能有效，但这从来都不是一个特别好的主意，因为它会在加载照片时卡住您的应用一段时间。有很多image loading libraries for Android它将处理异步加载您的ImageView。