我有这个 ImageView：
<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/black"
android:id="@+id/formSuggestionScroll">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:context=".SuggestQuestionActivity"
android:orientation="vertical"
android:scrollbars="vertical"
android:background="@android:color/black">
<Button
android:id="@+id/btnOpenGallery"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="@string/suggest_btnOpenGallery"
android:onClick="btnOpenGallery_click"
android:textColor="@android:color/white"
android:paddingTop="@dimen/buttons_paddingTop"/>
<ImageView
android:id="@+id/selectedPicContainer"
android:layout_width="@dimen/imagen_dimen_width"
android:layout_height="@dimen/imagen_dimen_height"
android:layout_marginTop="@dimen/image_padding"
android:adjustViewBounds="true"
android:layout_gravity="center_horizontal"
android:visibility="gone"/>
<Button
android:id="@+id/btnSend"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="@string/suggest_send"
android:onClick="btnSend_click"
android:textColor="@android:color/white"
android:paddingTop="@dimen/buttons_paddingTop"/>
</LinearLayout>
我想在用户选择图像表单库后使其可见：
public void onActivityResult(int requestCode, int resultCode, Intent data)
{
switch(requestCode){
case SELECT_PHOTO:
if(resultCode == RESULT_OK){
ImageView view = (ImageView) findViewById(R.id.selectedPicContainer);
imageUri = data.getData();
Bitmap galleryPic = scaleBitmap(getPathFromUri(imageUri), view.getHeight());
if(galleryPic != null){
view.setImageBitmap(galleryPic);
view.setVisibility(View.VISIBLE);
}else{
Toast toast = Toast.makeText(this, "selection failed", Toast.LENGTH_LONG);
toast.show();
}
}
break;
}
}
scaleBitmap 函数的代码：
private Bitmap scaleBitmap(String imagePath, int maxDimension) {
Bitmap scaledBitmap;
BitmapFactory.Options op = new BitmapFactory.Options();
op.inJustDecodeBounds = true;
scaledBitmap = BitmapFactory.decodeFile(imagePath,op);
if(maxDimension < op.outHeight || maxDimension < op.outWidth){
op.inSampleSize = Math.round(Math.max((float) op.outHeight / (float) maxDimension,
(float)op.outWidth / (float) maxDimension));
}
op.inJustDecodeBounds = false;
scaledBitmap = BitmapFactory.decodeFile(imagePath,op);
return scaledBitmap;
}
问题是 ImageView 显示的是彩色方块，而不是图片。颜色取决于选择的图像。因此，渲染可能有问题，但我对此的了解非常少。
如果我将可见性设置为不可见而不是消失，问题就会消失。
希望有人可以提供帮助。谢谢