在 Android 中以编程方式更改 ImageView 的图像

问题描述

当我以编程方式更改图像时，它会在最初在布局文件中设置的旧图像之上显示新图像?

When I change the image programmatically‎, it shows new image on top of the old image which is set originally in layout file?

这是我的布局文件的片段:

Here is a snippet of my layout file:

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="39dp"
    android:gravity="center_vertical" >
    <ImageView
        android:id="@+id/qStatusImage"
        android:layout_width="16dp"
        android:layout_height="16dp"
        android:layout_margin="5dp"
        android:background="@drawable/thumbs_down"
         />

    <TextView
        android:id="@+id/grp_child"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:textColor="@color/radio_colors"
        android:textStyle="normal"
        android:background="@color/grey"
    />

 </LinearLayout>

以及设置 imageView 的代码:

And the code that sets the imageView:

     @Override
public View getChildView(final int groupPosition, final int childPosition,
        boolean isLastChild, View convertView, ViewGroup parent) {
//Answers
            if(answersGroup != null)
                   answersGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {
                       @Override
                    public void onCheckedChanged(RadioGroup group, int checkedId) {

                         //  int index = answersGroup.indexOfChild(findViewById(answersGroup.getCheckedRadioButtonId()));

                           qImageView = (ImageView) V.findViewById(R.id.qStatusImage);
                           if(ans ==0 || ans == 5){
                            //   qSV.setImageResource(0);
                               qImageView.setImageResource(R.drawable.thumbs_up);
                           }
                           else
                               qImageView.setImageResource(R.drawable.thumbs_down);

                       }
                   });

我错过了什么?

推荐答案

这是因为你设置的是 ImageView 的 src 而不是背景.

That happens because you're setting the src of the ImageView instead of the background.

改用这个:

qImageView.setBackgroundResource(R.drawable.thumbs_down);

这里是一个讨论这两种方法之间差异的线程.

Here's a thread that talks about the differences between the two methods.

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