Android buttion 的四种事件

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XML文件如下:

<Button    android:id="@+id/button1"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="Button1" />   <Button    android:id="@+id/button2"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="Button2" />

1. 匿名内部类

public class TestButtonActivity extends Activity {   Button btn1, btn2;  Toast tst;   @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_test_button);     btn1 = (Button) findViewById(R.id.button1);    btn2 = (Button) findViewById(R.id.button2);     btn1.setOnClickListener(new OnClickListener() {       @Override      public void onClick(View v) {        // TODO Auto-generated method stub        Toast tst = Toast.makeText(TestButtonActivity.this, "111111111", Toast.LENGTH_SHORT);        tst.show();       }    });     btn2.setOnClickListener(new OnClickListener() {       @Override      public void onClick(View v) {        // TODO Auto-generated method stub        Toast tst = Toast.makeText(TestButtonActivity.this, "222222222", Toast.LENGTH_SHORT);        tst.show();      }    });  }}

2.自定义单击事件监听类

public class TestButtonActivity extends Activity {   Button btn1, btn2;  Toast tst;   class MyClickListener implements OnClickListener {     @Override    public void onClick(View v) {      // TODO Auto-generated method stub      switch (v.getId()) {      case R.id.button1:        tst = Toast.makeText(TestButtonActivity.this, "111111111", Toast.LENGTH_SHORT);        tst.show();        break;      case R.id.button2:        tst = Toast.makeText(TestButtonActivity.this, "222222222", Toast.LENGTH_SHORT);        tst.show();        break;      default:        break;      }    }  }   @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_test_button);     btn1 = (Button) findViewById(R.id.button1);    btn2 = (Button) findViewById(R.id.button2);     btn1.setOnClickListener(new MyClickListener());    btn2.setOnClickListener(new MyClickListener());  }}

3.Activity继承View.OnClickListener，由Activity实现OnClick(View view)方法，在OnClick(View view)方法中用switch-case对不同id代表的button进行相应的处理

public class TestButtonActivity extends Activity implements OnClickListener {   Button btn1, btn2;  Toast tst;   @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_test_button);     btn1 = (Button) findViewById(R.id.button1);    btn2 = (Button) findViewById(R.id.button2);     btn1.setOnClickListener(this);    btn2.setOnClickListener(this);  }   @Override  public void onClick(View v) {    // TODO Auto-generated method stub    switch (v.getId()) {    case R.id.button1:      tst = Toast.makeText(this, "111111111", Toast.LENGTH_SHORT);      tst.show();      break;    case R.id.button2:      tst = Toast.makeText(this, "222222222", Toast.LENGTH_SHORT);      tst.show();      break;    default:      break;    }  }}

4.最后一种是我今天看到的一种写法，在XML文件中“显示指定按钮的onClick属性，这样点击按钮时会利用反射的方式调用对应Activity中的click()方法”

public class TestButtonActivity extends Activity {   Button btn1, btn2;  Toast tst;   @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_test_button);  }   // 注意 这里没有 @Override 标签  public void onClick(View v) {    // TODO Auto-generated method stub    switch (v.getId()) {    case R.id.button1:      tst = Toast.makeText(this, "111111111", Toast.LENGTH_SHORT);      tst.show();      break;    case R.id.button2:      tst = Toast.makeText(this, "222222222", Toast.LENGTH_SHORT);      tst.show();      break;    default:      break;    }  }}

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