自定义view之绘画太极图

                  mainactivity中不需要打代码

public class MainActivity extends AppCompatActivity {       @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);          }}

       

       绘画太极 DrawView  继承view

<RelativeLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"    android:layout_height="match_parent" tools:context="com.bwie.a04_lian.MainActivity">    <view.DrawView               android:layout_width="wrap_content"        android:layout_height="wrap_content" /></RelativeLayout>