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我正在尝试制作一个简单的图片库，通过它可以设置壁纸；我正在使用下面的代码从下载文件夹中获取文件并在滚动视图中显示它。

我可以做到这一点，但现在我想获取当前显示的图像，以便我可以将该图像设置为墙纸。

以下是我的活动课程的代码：

public class MainActivity extends Activity {

 LinearLayout myGallery;

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

        myGallery = (LinearLayout)findViewById(R.id.mygallery);

        String ExternalStorageDirectoryPath = Environment
          .getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS)
          .getAbsolutePath();

        String targetPath = ExternalStorageDirectoryPath ;

        Toast.makeText(getApplicationContext(), targetPath, Toast.LENGTH_LONG).show();
        File targetDirector = new File(targetPath);

        File[] files = targetDirector.listFiles();
        for (File file : files){
         myGallery.addView(insertPhoto(file.getAbsolutePath()));

        }    
    }

    View insertPhoto(String path){
     Bitmap bm = decodeSampledBitmapFromUri(path, 520, 520);

     LinearLayout layout = new LinearLayout(getApplicationContext());
     layout.setLayoutParams(new LayoutParams(550, 550));//Size of view
     layout.setGravity(Gravity.CENTER);

     ImageView imageView = new ImageView(getApplicationContext());
     imageView.setLayoutParams(new LayoutParams(520, 520));
     imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
     imageView.setImageBitmap(bm);

     layout.addView(imageView);
     return layout;
    }

    public Bitmap decodeSampledBitmapFromUri(String path, int reqWidth, int reqHeight) {
     Bitmap bm = null;

     // First decode with inJustDecodeBounds=true to check dimensions
     final BitmapFactory.Options options = new BitmapFactory.Options();
     options.inJustDecodeBounds = true;
     BitmapFactory.decodeFile(path, options);

     // Calculate inSampleSize
     options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);

     // Decode bitmap with inSampleSize set
     options.inJustDecodeBounds = false;
     bm = BitmapFactory.decodeFile(path, options); 

     return bm;  
    }

    public int calculateInSampleSize(

     BitmapFactory.Options options, int reqWidth, int reqHeight) {
     // Raw height and width of image
     final int height = options.outHeight;
     final int width = options.outWidth;
     int inSampleSize = 1;

     if (height > reqHeight || width > reqWidth) {
      if (width > height) {
       inSampleSize = Math.round((float)height / (float)reqHeight);   
      } else {
       inSampleSize = Math.round((float)width / (float)reqWidth);   
      }   
     }

     return inSampleSize;   
    }

}

请告诉我如何获取当前显示在滚动视图中的图像。

谢谢阿曼

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1 回答 1

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已经5个月了还没有回答，但我想我会试着回答。我认为您需要一个自定义视图，即。画布。创建一个画布，然后在画布中创建一个位图。之后，当您从 URI 形式的线性布局中获取位图时，在您的代码中的方法 decodeSampledBitmapFromUri 您将获得位图，只需将该位图分配给画布上创建的位图。

于 2013-10-03T05:03:50.087 回答