Question

该应用程序允许我捕获照片，然后允许我接受或拒绝照片，向我显示已接受的图像，但不将其保存到设备中。所有帮助不胜感激？

public class MainActivity extends AppCompatActivity {

    private Button takePictureButton;
    private ImageView imageView;
    private Uri file;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        takePictureButton = (Button) findViewById(R.id.button_image);
        imageView = (ImageView) findViewById(R.id.imageview);

        if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
            takePictureButton.setEnabled(false);
            ActivityCompat.requestPermissions(this, new String[] { Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE }, 0);
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        if (requestCode == 0) {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED
                    && grantResults[1] == PackageManager.PERMISSION_GRANTED) {
                takePictureButton.setEnabled(true);
            }
        }
    }

    public void takePicture(View view) {
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        file = Uri.fromFile(getOutputMediaFile());
        intent.putExtra(MediaStore.EXTRA_OUTPUT, file);

        startActivityForResult(intent, 100);
    }

    private static File getOutputMediaFile(){
        File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
                Environment.DIRECTORY_PICTURES), "Demo");

        if (!mediaStorageDir.exists()){
            if (!mediaStorageDir.mkdirs()){
                Log.d("Demo", "failed to create directory");
                return null;
            }
        }

        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        return new File(mediaStorageDir.getPath() + File.separator +
                    "IMG_"+ timeStamp + ".jpg");
    }

        @Override
        protected void onActivityResult(int requestCode, int resultCode, Intent data) {
            if (requestCode == 100) {
                if (resultCode == RESULT_OK) {
                    imageView.setImageURI(file);
                }
            }
        }
}

Answer 1

检查您是否具有正确的存储权限。

我建议您先移动图像，然后重命名；

我创建的应用不允许我保存图片吗？

1 个答案: