应用程序 -> 相机 -> 照片 -> 低分辨率

Question

问题：

当我使用我的应用拍摄照片并将其存储在 SD 上时，分辨率为 160x120。 如果使用普通相机，照片分辨率为1920x2560。

那么，请帮我说说我必须做什么才能强制相机从应用程序开始以标准高分辨率拍照？

这是我用于启动相机意图和保存照片的代码：

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); 
    startActivityForResult(cameraIntent, CAMERA_REQUEST); 
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {  
    if (requestCode == CAMERA_REQUEST) { 

    Bundle xz = data.getExtras();
    if (xz!=null) {

    Bitmap image = (Bitmap) data.getExtras().get("data");

    String filePath = "/mnt/sdcard/DCIM/"; 
    filePath += "hml.png";
 try {
  image.compress(Bitmap.CompressFormat.PNG, 100, new FileOutputStream(new File(filePath)));
 } 
    catch (FileNotFoundException e) {
                 // TODO Auto-generated catch block
                e.printStackTrace();}  
    catch (NullPointerException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();       } 
    }}

谢谢！

Answer 1

我发现了同样的问题。也许我们使用前置摄像头。我发现还有另一个可以使用相机并发现代码崩溃。

AndroidManifest.xml：

    </application>
    <uses-sdk android:minSdkVersion="8" />
<uses-permission android:name="android.permission.CAMERA" />
   <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-feature android:name="android.hardware.camera"/>
<uses-feature android:name="android.hardware.camera.autofocus"/></manifest>

源代码：

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Calendar;
import java.util.Locale;

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.os.Bundle;
import android.text.format.DateFormat;
import android.util.Log;
import android.view.KeyEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.Window;
import android.view.WindowManager;
import android.widget.FrameLayout;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

    private CameraView cv;
    private Camera mCamera = null;
    private Bitmap mBitmap = null; 

    public Camera.PictureCallback pictureCallback = new Camera.PictureCallback() {

        public void onPictureTaken(byte[] data, Camera camera) {
            Log.i("yao","onPictureTaken");
            Toast.makeText(getApplicationContext(), "saving……", Toast.LENGTH_LONG).show();
            mBitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
            File file = new File("/sdcard/YY"+ new DateFormat().format("yyyyMMdd_hhmmss", Calendar.getInstance(Locale.CHINA)) + ".jpg");
            try {
                file.createNewFile();
                BufferedOutputStream os = new BufferedOutputStream(new FileOutputStream(file));
                mBitmap.compress(Bitmap.CompressFormat.PNG, 100, os);
                os.flush();
                os.close();
                Toast.makeText(getApplicationContext(), "save completed", Toast.LENGTH_LONG).show();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    };

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
        getWindow().setFormat(PixelFormat.TRANSLUCENT);

        FrameLayout  fl = new FrameLayout(this);     

        cv = new CameraView(this);
        fl.addView(cv);

        TextView tv = new TextView(this);
        tv.setText("take a picture");
        fl.addView(tv);

        setContentView(fl);

    }

    public boolean onKeyDown(int keyCode, KeyEvent event) {
        Log.i("yao","MainActivity.onKeyDown");
        if (keyCode == KeyEvent.KEYCODE_CAMERA) {
            if (mCamera != null) {
                Log.i("yao","mCamera.takePicture");
                mCamera.takePicture(null, null, pictureCallback);
            }
        }
        return cv.onKeyDown(keyCode, event);
    }

    class CameraView extends SurfaceView {

        private SurfaceHolder holder = null;

        public CameraView(Context context) {
            super(context);
            Log.i("yao","CameraView");

            holder = this.getHolder();
            holder.addCallback(new SurfaceHolder.Callback() {

                @Override
                public void surfaceDestroyed(SurfaceHolder holder) {
                    mCamera.stopPreview();
                    mCamera.release();
                    mCamera = null;
                }

                @Override
                public void surfaceCreated(SurfaceHolder holder) {
                    mCamera = Camera.open();
                    try {
                        mCamera.setPreviewDisplay(holder);
                    } catch (IOException e) {
                        mCamera.release();
                        mCamera = null;
                    }

                }

                @Override
                public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

                    Camera.Parameters parameters = mCamera.getParameters();
                    parameters.setPictureFormat(PixelFormat.JPEG);
                    parameters.setPreviewSize(854, 480);
                    parameters.setFocusMode("auto");
                    parameters.setPictureSize(2592, 1456);
                    mCamera.setParameters(parameters);
                    mCamera.startPreview();
                }
            });
            holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
        }

    }

}

Answer 2

如果您不为输出图​​像提供 uri，则相机意图将仅返回图片的缩略图。请按照以下说明正确执行此操作： http://www.tutorialforandroid.com/2010/10/take-picture-in-android-with.html