如题，下面就一一列出对点击事件响应的4种方式：

第一种：内部类的形式：

package com.example.dail;

import android.net.Uri;

import android.os.Bundle;

import android.renderscript.Int2;

import android.text.TextUtils;

import android.app.Activity;

import android.content.Intent;

import android.view.Menu;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {

	private Button bt_dail = null;

	private EditText et_number = null;

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.activity_main);

		bt_dail = (Button) findViewById(R.id.bt_dail);

		et_number = (EditText) findViewById(R.id.et_number);

		bt_dail.setOnClickListener(new MyListener());

	}

	private void callPhone() {

		String number = et_number.getText().toString();

		if(TextUtils.isEmpty(number)) {

			Toast.makeText(MainActivity.this, "号码不能为空", 1).show();

		}

		Intent intent = new Intent();

		intent.setAction(Intent.ACTION_CALL);

		intent.setData(Uri.parse("tel:"+number));

		startActivity(intent);

	}

	private class MyListener implements OnClickListener{

		@Override

		public void onClick(View v) {

			// TODO Auto-generated method stub

			callPhone();

		}

	}

}

创建一个内部类MyListener实现OnClickListener接口。

第二种：匿名内部类：

package com.example.dail;

import android.net.Uri;

import android.os.Bundle;

import android.renderscript.Int2;

import android.text.TextUtils;

import android.app.Activity;

import android.content.Intent;

import android.view.Menu;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {

	private Button bt_dail = null;

	private EditText et_number = null;

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.activity_main);

		bt_dail = (Button) findViewById(R.id.bt_dail);

		et_number = (EditText) findViewById(R.id.et_number);

		bt_dail.setOnClickListener(new OnClickListener(){

			public void onClick(View v){

				callPhone();

			}

		});

	}

	private void callPhone() {

		String number = et_number.getText().toString();

		if(TextUtils.isEmpty(number)) {

			Toast.makeText(MainActivity.this, "号码不能为空", 1).show();

		}

		Intent intent = new Intent();

		intent.setAction(Intent.ACTION_CALL);

		intent.setData(Uri.parse("tel:"+number));

		startActivity(intent);

	}

}

第三种：在xml布局文件中，定义onclick的方式

<Button

	    android:onClick="btOnClick"

	    android:id="@+id/bt_dail"

	    android:layout_width="match_parent"

	    android:layout_height="wrap_content"

	    android:layout_below="@id/et_number"

	    android:text="@string/dail"/>"

然后再主类里面实现btOnClick方法，

private void btOnClick() {

		callPhone();

}

private void callPhone() {

		String number = et_number.getText().toString();

		if(TextUtils.isEmpty(number)) {

			Toast.makeText(MainActivity.this, "号码不能为空", 1).show();

		}

		Intent intent = new Intent();

		intent.setAction(Intent.ACTION_CALL);

		intent.setData(Uri.parse("tel:"+number));

		startActivity(intent);

}

第四种：让主类实现OnClickListener接口，然后再主类实现未实现的方法

package com.example.dail;

import android.net.Uri;

import android.os.Bundle;

import android.renderscript.Int2;

import android.text.TextUtils;

import android.app.Activity;

import android.content.Intent;

import android.view.Menu;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {

	private Button bt_dail = null;

	private EditText et_number = null;

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.activity_main);

		bt_dail = (Button) findViewById(R.id.bt_dail);

		et_number = (EditText) findViewById(R.id.et_number);

		bt_dail.setOnClickListener(this);

	}

	private void callPhone() {

		String number = et_number.getText().toString();

		if(TextUtils.isEmpty(number)) {

			Toast.makeText(MainActivity.this, "号码不能为空", 1).show();

		}

		Intent intent = new Intent();

		intent.setAction(Intent.ACTION_CALL);

		intent.setData(Uri.parse("tel:"+number));

		startActivity(intent);

	}

	@Override

	public void onClick(View v) {

		callPhone();

	}

}

如上所述，4种点击事件的响应方式就是如此。