Android中Button四种点击事件实现模式

1 <Button
2         android:id="@+id/bt1"
3         android:layout_width="wrap_content"
4         android:layout_height="wrap_content"
5         android:onClick="doClick"
6         android:text="XML添加doClick"
7         android:layout_above="@+id/bt2"
8         android:layout_marginBottom="47dp"
9        />

1 public void doClick(View view) {
2         switch (view.getId()) {
3             case R.id.bt1:
4                 Toast.makeText(MainActivity.this, "第一种点击事件：Xml添加doClick", Toast.LENGTH_SHORT).show();
5                 break;
6 
7         }
8 
9     }

1        Button bt2 = (Button) findViewById(R.id.bt2);
2        bt2.setOnClickListener(new View.OnClickListener() {
3              @Override
4              public void onClick(View v) {
5                  Toast.makeText(MainActivity.this, "第二种点击事件：匿名内部类", Toast.LENGTH_SHORT).show();
6              }
7          });

1  Button bt3 = (Button) findViewById(R.id.bt3);
2          bt3.setOnClickListener(new MyListener());
3 class MyListener implements View.OnClickListener {
4     @Override
5     public void onClick(View v) {
6         Toast.makeText(MainActivity.this, "第三种方法：自定义点击事件", Toast.LENGTH_SHORT).show();
7     }
8 }

 1 public class MainActivity extends AppCompatActivity implements View.OnClickListener {
 2     @Override
 3     protected void onCreate(Bundle savedInstanceState) {
 4         super.onCreate(savedInstanceState);
 5         setContentView(R.layout.activity_main);
 6  Button bt4=(Button)findViewById(R.id.bt4);
 7     bt4.setOnClickListener(this);
 8 }
 9 
10 @Override
11     public void onClick(View v) {
12         switch (v.getId()) {
13             case R.id.bt4:
14                 Toast.makeText(MainActivity.this,
15                         "第四种点击事件：Activity继承View.OnClickListener，由Activity实现OnClick(View view)方法",
16                         Toast.LENGTH_SHORT).show();
17         }
18     }
19 }