自定义控件

点击Button，EditText里的字会清空

MainActivity:

 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     android:layout_width="match_parent"
 3     android:layout_height="match_parent"
 4     android:orientation="vertical" >
 5 
 6     <com.example.canvastest.MyView
 7         android:layout_width="match_parent"
 8         android:layout_height="0dp"
 9         android:layout_weight="1" />
10 
11 </LinearLayout>

1 public class MainActivity extends Activity {
2     public static final String TAG = "MainActivity";
3 
4     @Override
5     protected void onCreate(Bundle savedInstanceState) {
6         super.onCreate(savedInstanceState);
7         setContentView(R.layout.activity_main);
8     }
9 }

MyView:

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:orientation="vertical" >
 6 
 7     <EditText
 8         android:id="@+id/edt"
 9         android:layout_width="match_parent"
10         android:layout_height="wrap_content" />
11 
12     <Button
13         android:id="@+id/btn"
14         android:layout_width="match_parent"
15         android:layout_height="wrap_content"
16         android:text="clear" />
17 
18 </LinearLayout>

 1 public class MyView extends LinearLayout implements View.OnClickListener {
 2     private EditText edt;
 3     private Button btn;
 4 
 5     public MyView(Context context, AttributeSet attrs) {
 6         super(context, attrs);
 7 
 8         LayoutInflater inflater = (LayoutInflater) context
 9                 .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
10         View view = inflater.inflate(R.layout.myview, this);
11 
12         edt = (EditText) view.findViewById(R.id.edt);
13 
14         btn = (Button) view.findViewById(R.id.btn);
15         btn.setOnClickListener(this);
16     }
17 
18     @Override
19     public void onDraw(Canvas canvas) {
20         super.onDraw(canvas);
21     }
22 
23     @Override
24     public void onClick(View v) {
25         switch (v.getId()) {
26         case R.id.btn:
27             edt.setText("");
28             break;
29         }
30     }
31 }