1.使用接口继承按钮监听方法:
public class Hello_to_worldActivity extends Activity implements Button.OnClickListener{
private Button btn_say_hello;
private TextView hello_world;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main); btn_say_hello = (Button)findViewById(R.id.bnt_SAY_HELLO_TO_WORLD);
hello_world = (TextView)findViewById(R.id.textView1);
btn_say_hello.setOnClickListener(this) ;//由于该类继承了BUTTON的监听, } //因此设置监听的参数只需传本类的对象即可
public void onClick(View v) {
// TODO Auto-generated method stub
//抽象接口的内部方法的实现
}
2.使用接口继承view类的监听方法
import android.view.View.OnClickListener;
public class Hello_to_worldActivity extends Activity implements OnClickListener{
private Button btn_say_hello;
private TextView hello_world;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btn_say_hello = (Button)findViewById(R.id.bnt_SAY_HELLO_TO_WORLD);
hello_world = (TextView)findViewById(R.id.textView1);
btn_say_hello.setOnClickListener(this) ;//由于该类继承了view的监听,
} //因此设置监听的参数只需传本类的对象即可
public void onClick(View v) {
//抽象接口的内部方法的实现
} }
3.不用接口,在类内部直接实现监听
public class Hello_to_worldActivity extends Activity {
private Button btn_say_hello;
private TextView hello_world;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btn_say_hello = (Button)findViewById(R.id.bnt_SAY_HELLO_TO_WORLD);
hello_world = (TextView)findViewById(R.id.textView1);
btn_say_hello.setOnClickListener(new Button.OnClickListener(){
public void onClick(View v) { //使用匿名的Button实例
//抽象接口的内部方法的实现
} }) ; } }
4.如果不使用匿名实例,也可以定义一个具体的实例,如下
public class Hello_to_worldActivity extends Activity {
private Button btn_say_hello; @Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btn_say_hello = (Button)findViewById(R.id.bnt_SAY_HELLO_TO_WORLD);
btn_listener bl = new btn_listener();
btn_say_hello.setOnClickListener(bl); //bl是类btn_listener的实例,而btn_listener为监听方法的接口
} //因此设置监听的参数只需传本类的对象即可
}
class btn_listener implements Button.OnClickListener
{
public void onClick(View v) {
} }
5.多个button如何识别
button1.setOnClickListener(this);
button1.setTag(B1);
button2.setOnClickListener(this);
button2.setTag(B2);
button3.setOnClickListener(this);
button3.setTag(B3);
@Override public void onClick(View v) { int tag = (Integer) v.getTag(); switch (tag){ case B1:
//
break;
.......
}
}