java - 在 Android 中使用图库图像更改图像按钮

Question

我已经四处寻找解决我遇到的以下问题的方法，但没有找到任何东西。在应用程序中，我有一个带有预定义可绘制对象的 ImageButton。我的目的是让用户能够单击此图像按钮，从手机的图像库中选择一张图片并显示该图片，直到用户再次更改它。到目前为止，我设法显示 ImageGallery 并能够选择图片，但我无法执行以下操作:

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 内

        <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 代码如下所示:

    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圈的自定义背景。

不要使用android:src="@drawable/dp_holder_large"

因为一旦你给它设置了图像，那么圆圈就会消失

问题2的解决方案:

您需要使用startActivityForResult()方法调用新 Activity

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

并在您的 onActivityResult() 方法中执行

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