android 为按钮添加响应事件的五种写法

<span style="font-family:Comic Sans MS;font-size:18px;">package com.huawei.dialphone;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends Activity implements OnClickListener{
private Button dialButton;
private EditText phoneNum;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
dialButton = (Button)findViewById(R.id.dial);
phoneNum = (EditText)findViewById(R.id.phone);
<span style="color:#ff0000;">//第一种：使用内部类来实现按钮监听</span>
DialListener listener = new DialListener();
dialButton.setOnClickListener(listener);

<span style="color:#ff0000;">//第二种：创建匿名类的实例，并赋给成员变量</span>
dialButton.setOnClickListener(this.listener);
<span style="color:#ff0000;"> //第三种：直接使用匿名内部类的匿名实例来实现按钮的监听</span>
dialButton.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View arg0) {
String phoneNumText = phoneNum.getText().toString();

if(( phoneNumText != null) && (!"".equals(phoneNumText.trim()))){
//                    Intent intent = new Intent(Intent.ACTION_CALL, Uri.parse("tel:"+phoneNumText));
Intent intent = new Intent();
intent.setAction(Intent.ACTION_CALL);
intent.setData(Uri.parse("tel:" + phoneNumText));
startActivity(intent);
}
}
});
<span style="color:#ff0000;">//第四种：自身实现监听接口，完成按钮点击事件的响应</span>
dialButton.setOnClickListener(this);
}

View.OnClickListener listener = new View.OnClickListener() {

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
String phone = phoneNum.getText().toString();
Intent intent = new Intent();

intent.setAction(Intent.ACTION_CALL);
intent.setData(Uri.parse("tel:" + phone));
}
};
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

class DialListener implements View.OnClickListener {

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
String phone = phoneNum.getText().toString();
Intent intent = new Intent();

intent.setAction(Intent.ACTION_CALL);
intent.setData(Uri.parse("tel:" + phone));
}

}
/<span style="color:#ff0000;">/第四种：通过类本身实现点击接口来完成按钮的监听</span>
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
String phone = phoneNum.getText().toString();
Intent intent = new Intent();

intent.setAction(Intent.ACTION_CALL);
intent.setData(Uri.parse("tel:" + phone));
}

}
</span>