如何在 Android 上使用 MediaStore 将数据从相机保存到磁盘? [英] How do I save data from Camera to disk using MediaStore on Android?

问题描述

对于我的应用程序，我一直在使用我自己的 Camera 类来拍摄图像和我自己的数据库，但很快我就跟不上变化了，我决定使用 Android 中内置的相机应用程序来完成工作，但我似乎无法让它保存文件.我在这里想念什么?该应用程序似乎保存了文件，但它只有 0 个字节.我查找了 Camera 应用程序的源代码，它正在 Extras 中寻找输出"来保存文件.任何帮助将不胜感激.

For my application, I'd been using my own Camera class for taking images and my own database but soon enough I couldn't really keep up with changes and I decided to use the built in camera application in Android to do the job, but I can't seem to get it to save file. What am I missing here? The application seems to save the file but it's just 0 bytes. I looked up the source code of the Camera application and it's looking for the "output" in Extras to save the file. Any help would be greatly appreciated.

Public class CameraTest extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Button cameraButton = (Button) findViewById(R.id.cameraButton);
        cameraButton.setOnClickListener( new OnClickListener(){
            public void onClick(View v ){
                ContentValues values = new ContentValues();
                values.put(Images.Media.TITLE, "title");
                values.put(Images.Media.BUCKET_ID, "test");
                values.put(Images.Media.DESCRIPTION, "test Image taken");
                Uri uri = getContentResolver().insert(Media.EXTERNAL_CONTENT_URI, values);
                Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
                intent.putExtra("output", uri.getPath());
                startActivityForResult(intent,0);
            }
        });

    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode== 0 && resultCode == Activity.RESULT_OK){
            ((ImageView)findViewById(R.id.pictureView)).setImageURI(data.getData());
        }
    }


}

推荐答案

这适用于以下代码，当然我对最后一个有点愚蠢.我仍然认为必须有一种更好的方法，以便原始图像仍然保存在某个地方.它仍然向我发送较小的 25% 大小的图像.

This worked with the following code, granted I was being a little dumb with the last one. I still think there's got to be a better way so that the original image is still saved somewhere. It still sends me the smaller 25% size image.

public class CameraTest extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    Button cameraButton = (Button) findViewById(R.id.cameraButton);
    cameraButton.setOnClickListener( new OnClickListener(){
        public void onClick(View v ){

            Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");

            startActivityForResult(intent,0);
        }
    });

}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode== 0 && resultCode == Activity.RESULT_OK) {
        Bitmap x = (Bitmap) data.getExtras().get("data");
        ((ImageView)findViewById(R.id.pictureView)).setImageBitmap(x);
        ContentValues values = new ContentValues();
        values.put(Images.Media.TITLE, "title");
        values.put(Images.Media.BUCKET_ID, "test");
        values.put(Images.Media.DESCRIPTION, "test Image taken");
        values.put(Images.Media.MIME_TYPE, "image/jpeg");
        Uri uri = getContentResolver().insert(Media.EXTERNAL_CONTENT_URI, values);
        OutputStream outstream;
        try {
            outstream = getContentResolver().openOutputStream(uri);
            x.compress(Bitmap.CompressFormat.JPEG, 70, outstream);
            outstream.close();
        } catch (FileNotFoundException e) {
            //
        } catch (IOException e) {
            //
        }
    }
}

另外，我知道 Android 的纸杯蛋糕版本应该很快会修复小图像尺寸.

Also, I do know that the cupcake release of Android should fix the small image size soon.

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