在Android中用Gallery图像更改图像按钮

Question

我四处寻找下面问题的解决方案，但一无所获。在应用程序中，我有一个ImageButton，它有一个预定义的可绘制内容。我的功能是让用户点击这个ImageButton，从手机的图像库中选择一张图片，并显示该图片，直到用户再次更改为止。到目前为止，我设法让ImageGallery显示并能够选择图片，但我无法做到以下几点：

1. Show the Picture from the Picture Gallery in the shape of the original drawable -- it is a circle
2. When I change activity and come back to this activity, the picture chosen is not there anymore.

我的代码如下所示：ImageButton的XML位于LinearLayout 中

        <ImageButton 
            android:id="@+id/AddPic"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="0.4"
            android:background="#00FFFFFF"
            android:contentDescription="@string/MyInformation"
            android:gravity="left"
            android:onClick="AddPic"
            android:src="@drawable/dp_holder_large" 
            />

我的Java代码如下：

    public class MyInformation extends Activity{
    ImageButton imgButton;   
    public static int RESULT_LOAD_IMAGE = 1;
   @Override  
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.myinformation);

        //Adding the picture bit   
        imgButton = (ImageButton) findViewById(R.id.AddPic);
        imgButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent GaleryIntent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                startActivityForResult(GaleryIntent, RESULT_LOAD_IMAGE);
            }
        });
    }
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && null != data) {
            Uri SelectedImage = data.getData();
            String[] FilePathColumn = {MediaStore.Images.Media.DATA };
            Cursor SelectedCursor = getContentResolver().query(SelectedImage, FilePathColumn, null, null, null);
            SelectedCursor.moveToFirst();
            int columnIndex = SelectedCursor.getColumnIndex(FilePathColumn[0]);
            String picturePath = SelectedCursor.getString(columnIndex);
            SelectedCursor.close();
          //  Drawable d = new BitmapDrawable(getResources(),BitmapFactory.decodeFile(picturePath)); 
           // btnOpenGalery .setImageBitmap(d);
            imgButton.setImageBitmap(BitmapFactory.decodeFile(picturePath));
            Toast.makeText(getApplicationContext(), picturePath, Toast.LENGTH_SHORT).show();
        }
    }   
     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         // Inflate the menu; this adds items to the action bar if it is present.
         getMenuInflater().inflate(R.menu.main, menu);
         return true;
     }
}

谢谢！

Answer 1

问题1的解决方案：

删除背景并制作带有圆形的自定义背景。

不使用android:src="@drawable/dp_holder_large"

因为一旦你将图像设置为它，那么圆圈将消失

问题2的解决方案：

您需要使用startActivityForResult()方法调用新活动

Intent newIntent = new Intent(CurrentActivity.this, NextActivity.class);
startActivityForResult(newIntent, 2);

在你的onActivityResult()方法中进行

if(resultCode==2){
imgButton.setImageBitmap(BitmapFactory.decodeFile(picturePath));//where picturePath is the path
}