Android - 相机意图低位图质量

Question

使用 android 相机 Intent 拍照时，我得到一张低质量的位图图像。我想知道是否有可能使此图像具有良好的质量。

我用谷歌搜索了一些关于它的信息，我认为我必须使用“EXTRA_OUTPUT”（ http://developer.android.com/reference/android/provider/MediaStore.html#ACTION_IMAGE_CAPTURE ）

我很挣扎，因为我不知道把它放在哪里，我不知道它是否能解决我的问题。

按 btnTakePhoto 后，我更改布局并打开 android 相机。位图显示在第二个布局中（低质量）。这是我的代码：

 import android.content.Intent;
import android.graphics.Bitmap;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.ImageView;

public class Camera extends AppCompatActivity {
    ImageButton btnTakePhoto;
    ImageView imgTakenPhoto;
    private static final int CAM_REQUEST = 1313;

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

        btnTakePhoto = (ImageButton) findViewById(R.id.buttonFoto);
        imgTakenPhoto = (ImageView) findViewById(R.id.genomenFoto);

    btnTakePhoto.setOnClickListener(new btnTakePhotoClicker());
}
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if(requestCode == CAM_REQUEST){
            setContentView(R.layout.share);
            Bitmap thumbnail = (Bitmap) data.getExtras().get("data");
            imgTakenPhoto = (ImageView) findViewById(R.id.genomenFoto);
            imgTakenPhoto.setImageBitmap(thumbnail);
        }
    }

    class btnTakePhotoClicker implements Button.OnClickListener {

        @Override
        public void onClick(View v) {
            Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
            startActivityForResult(cameraIntent, CAM_REQUEST);
        }
    }

    //CameraShare layout -- back button - Go back to first layout
    public void ibBackToPhotograph(View v) {
        setContentView(R.layout.camera);
        btnTakePhoto = (ImageButton) findViewById(R.id.buttonFoto);
        btnTakePhoto.setOnClickListener(new btnTakePhotoClicker());
    }
}

编辑：图像未保存在任何地方。接受后会在 facebook 上发布 (snapchat)

原文由 Meindert Stijfhals 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 1

不要使用 bitmap ，而是使用 uri 。

  ImageView imageView;
 Uri image;
 String mCameraFileName;

 private void cameraIntent() {
        StrictMode.VmPolicy.Builder builder = new StrictMode.VmPolicy.Builder();
        StrictMode.setVmPolicy(builder.build());
        Intent intent = new Intent();
        intent.setAction(MediaStore.ACTION_IMAGE_CAPTURE);

        Date date = new Date();
        DateFormat df = new SimpleDateFormat("-mm-ss");

        String newPicFile = df.format(date) + ".jpg";
        String outPath = "/sdcard/" + newPicFile;
        File outFile = new File(outPath);

        mCameraFileName = outFile.toString();
        Uri outuri = Uri.fromFile(outFile);
        intent.putExtra(MediaStore.EXTRA_OUTPUT, outuri);
        startActivityForResult(intent, 2);
    }

  @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == Activity.RESULT_OK) {
            if (requestCode == 2) {
                if (data != null) {
                    image = data.getData();
                    imageView.setImageURI(image);
                    imageView.setVisibility(View.VISIBLE);
                }
                if (image == null && mCameraFileName != null) {
                    image = Uri.fromFile(new File(mCameraFileName));
                    imageView.setImageURI(image);
                    imageView.setVisibility(View.VISIBLE);
                }
                File file = new File(mCameraFileName);
                if (!file.exists()) {
                    file.mkdir();
                }
            }
        }
    }

原文由 John Joe 发布，翻译遵循 CC BY-SA 4.0 许可协议