Android中button的onClick事件几种方法

package com.example.androidtest;  import android.os.Bundle; import android.app.Activity; import android.content.Intent; import android.view.Menu; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; import android.view.View; import android.widget.TextView;  import android.view.View.OnClickListener; import android.widget.Button;  //import android.text.Editable;  //import android.text.TextWatcher;  import android.widget.EditText;  public class MainActivity extends Activity  {     @Override  protected void onCreate(Bundle savedInstanceState)   {     super.onCreate(savedInstanceState);     setContentView(R.layout.activity_main);     Button    button1 = (Button)findViewById(R.id.button1);       Button    button2 = (Button)findViewById(R.id.button2);      //方法一：     //增加事件响应       button1.setOnClickListener(new Button.OnClickListener()     {         public void onClick(View v)        {                 Intent intent =new Intent();         intent.setClass(MainActivity.this, TestActivity.class);         MainActivity.this.startActivity(intent);       }          });          button2.setOnClickListener(new Button.OnClickListener()     {         public void onClick(View v)        {                 Intent intent =new Intent();         intent.setClass(MainActivity.this, TActivity.class);         MainActivity.this.startActivity(intent);       }          });   }