TextView为什么变得不可见?
layout xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/tvRotate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Rotate Me"
/>
</LinearLayout>
Activity:
public class RotateMeActivity extends Activity
{
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
TextView tvRotate = (TextView) findViewById(R.id.tvRotate);
RotateAnimation r = new RotateAnimation(0, 180, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
r.setDuration(0);
r.setFillAfter(true);
tvRotate.startAnimation(r);
tvRotate.setVisibility(View.INVISIBLE);
}
}
我想实现的功能是能让试图能旋转,然后可以隐藏,通过设置setVisibility可以在代码中显示出来。在API Level 11中setRotation是可以实现的,但是在API Level 10中就不行。什么原因呢?
tvRotate.setRotation(180);//instead of the RotateAnimation, only works in API Level 11
tvRotate.setVisibility(View.INVISIBLE);