定义圆角矩形背景

XML文件 res/drawable/my_rounded_rectangle.xml

<?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android" >    <solid  android:color="#f0600000"/>    <stroke android:width="3dp"   android:color="#ffff8080"/>    <corners  android:radius="5dp"/>    <padding  android:left="10dp"         android:top="10dp"        android:right="10dp"        android:bottom="10dp"/></shape>

在Java中使用图像

    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        GradientDrawable roundedRectangle=(GradientDrawable) this.getResources().getDrawable(R.drawable.my_rounded_rectangle);        TextView tv=(TextView)findViewById(R.id.text1);        tv.setBackgroundDrawable(roundedRectangle);    }