<span style="font-family: Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255);">1)點擊按鈕的實現類接口; //弊端,按鈕多的話,代碼冗餘;</span>
1.findViewByID();2.btn.setOnClickListener(new MyOnClickListener());//實現類的接口;
3.class MyOnClickListener implements OnClickListener{
public void onClick(View v){
Toast.makeText(mainActivity,"print...",0).show();
}
}
2),在類中實現類接口的方法,採用當前傳遞this ,實現onClick()方法;並在裏頭加入switch case 來判斷按鈕,進行操作;
按鈕非常多 public class MainActivity extends ActionBarActivity implements OnClickListener
1.findViewByID();//獲取id
2.btn.setOnClickListener(this);//設置按鈕監聽器;
3.public void onClick(View v){
switch(v.getId()){
case R.id.btn1:
Toast.makeText(this,"print...",0).show();
}
}
3)在按鈕監聽器下直接new一個匿名內部類//這個匿名內部類可以是一個接口
btn.setOnClickListener(new OnClickListener{
public onClick(View v){
Toast.makeText(MainActivity.this,"string ....",0).show();
}
});
4)僅僅用於Demo示例時,此時無需要定義按鈕的id
1.在xml佈局文件中使用
android:onClick="哈哈"
2.在java的實現邏輯方法中自動生成一個 "哈哈"的方法
public void 哈哈(View v){
Toast.makeText(mainActivity.this,"input....",0).show();
}
在低下附上源代碼MainActivity.java:
package com.weibo.onclick;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.Toast;
import android.os.Build;
public class MainActivity extends ActionBarActivity implements OnClickListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_main);
Button btn_click1 =(Button) findViewById(R.id.btn_click1);
Button btn_click2 =(Button) findViewById(R.id.btn_click2);
Button btn_click3 =(Button) findViewById(R.id.btn_click3);
Button btn_click4 =(Button) findViewById(R.id.btn_click4);
/*
//1.內部類方法獲取按鈕
btn_click1.setOnClickListener(new MyOnClikListener());
btn_click2.setOnClickListener(new MyOnClikListener2());
btn_click3.setOnClickListener(new MyOnClikListener3());
*/
/*
//2.匿名內部類實現
btn_click1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(MainActivity.this, "按鈕按鈕1", 0).show();
}
});
btn_click2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(MainActivity.this, "按鈕按鈕2", 0).show();
}
});*/
/* //3.用switch方法實現
btn_click1.setOnClickListener(this);
btn_click2.setOnClickListener(this);
btn_click3.setOnClickListener(this);
btn_click4.setOnClickListener(this);*/
}
class MyOnClikListener implements OnClickListener{
@Override
public void onClick(View v) {
Toast.makeText(MainActivity.this, "按按鈕鈕1", 0).show();
}
}
class MyOnClikListener2 implements OnClickListener{
@Override
public void onClick(View v) {
Toast.makeText(MainActivity.this, "按按鈕鈕2", 0).show();
}
}
class MyOnClikListener3 implements OnClickListener{
@Override
public void onClick(View v) {
Toast.makeText(MainActivity.this, "按按鈕鈕3", 0).show();
}
}
@Override
public void onClick(View v) {
switch(v.getId()){
case R.id.btn_click1:
Toast.makeText(this, "bt1", 0).show();
break;
case R.id.btn_click2:
Toast.makeText(this, "bt2", 0).show();
break;
case R.id.btn_click3:
Toast.makeText(this, "bt3", 0).show();
break;
default :
Toast.makeText(this, "bt4", 0).show();
}
}
public void 哈哈(View v){
Toast.makeText(this, "哈哈", 0).show();
}
public void 點點(View v){
Toast.makeText(this, "點點", 0).show();
}
}