Button 设置监听事件的常用四种方式
布局xml
<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" />
第一种，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();
}
});
}
}
第二种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());
}
}
第三种 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;
}
}
}
第四种 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
<Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="onClick" android:text="Button1" /> <Button android:id="@+id/button2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="onClick" android:text="Button2" />
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;
}
}
}
粗略总结一下，就是按钮少的时候用匿名内部类会比较快，比如写demo测试的时候或者登陆界面之类的。
按钮多的情况我还是选择第三种方法，方便。