相关疑难解决方法(0)

更新:我使用本答案中描述的方法解决了这个问题

我对这个问题有点困惑,我认为应该很简单.

所以我的应用程序下载了一个图像,并在ImageView中呈现位图,ImageView是RelativeLayout的子元素.我希望ImageView适合父宽度,并调整它的大小以保持纵横比.

这是我的XML:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<RelativeLayout android:id="@+id/banner" android:layout_width="fill_parent" android:layout_height="wrap_content"></RelativeLayout>
<TextView  
android:layout_width="fill_parent" 
android:layout_height="wrap_content" 
android:text="@string/hello"
/>
</LinearLayout>

和代码:

public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);


    RelativeLayout banner = (RelativeLayout) findViewById(R.id.banner);
    ImageView imgV = new ImageView(this);

    imgV.setScaleType(ImageView.ScaleType.CENTER_CROP);
    // I tried all the scale types : CENTER_INSIDE : same effect, FIT_CENTER : same effect... 

    imgV.setBackgroundColor(0x00FFFF00);

    imgV.setAdjustViewBounds(Color.BLUE);


    RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.FILL_PARENT, RelativeLayout.LayoutParams.WRAP_CONTENT);

    banner.addView(imgV,params);

    // Some code downloading the image stream

    bitmap = BitmapFactory.decodeStream(stream); …