android句柄选择器状态

Question

我使用以下代码将图像从内部存储器加载到选项卡图标。对于state_enabled，图像可以正确加载，但在state_selected时不会发生变化。我做错了什么？谢谢。

ImageView icon = (ImageView) tabIndicator.findViewById(R.id.icon);

        File imgFile = new  File("data/data/"+PACKAGE_NAME+"/biblioteca/" + imageName);
        File imgFileSel = new  File("data/data/"+PACKAGE_NAME+"/biblioteca/" + imageName);

        Bitmap myBitmap = BitmapFactory.decodeFile(imgFile.getAbsolutePath());
        Drawable d = new BitmapDrawable(myBitmap);

        Bitmap myBitmapSelected = BitmapFactory.decodeFile(imgFileSel.getAbsolutePath());
        Drawable dSel = new BitmapDrawable(myBitmapSelected);

        StateListDrawable selector = new StateListDrawable();
        selector.addState(new int[]{ android.R.attr.state_enabled }, d);
        selector.addState(new int[]{ android.R.attr.state_selected }, dSel);
        icon.setImageDrawable(selector);}

xml会给出一个警告"missing content description“

<ImageView android:id="@+id/icon"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:src="@drawable/icon"

    /> 

Answer 1

state_pressed帮助你..。

和

missing content description  

ant its Lint error checking ....Its不会造成差异，，，

Answer 2

StateListDrawable selector = new StateListDrawable();
selector.addState(new int[]{ android.R.attr.state_pressed }, dSel);
selector.addState(new int[]{ android.R.attr.state_focussed }, dSel);
selector.addState(new int[]{ android.R.attr.state_enabled }, d);
selector.addState(new int[]{ android.R.attr.state_selected }, dSel);
icon.setImageDrawable(selector);

也可以参考这个LINK