view.performClick()触发点击事件

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <Button
        android:id="@+id/bt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="点击一下" />

    <Button
        android:id="@+id/bt2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/bt"
        android:text="@string/hello_world" />

</RelativeLayout>

package com.android;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity {

    Button button1 ;
    Button button2 ;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main );

        button1 = (Button) findViewById( R.id.bt ) ; 
        button1.setOnClickListener( new OnClickListener() {
            @Override
            public void onClick(View v) {
                button2.performClick();  //调用 button2的点击事件
            }
        });

        button2 = (Button) findViewById( R.id.bt2 ) ;
        button2.setOnClickListener( new OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText( MainActivity.this , "点击了", Toast.LENGTH_SHORT).show();
            }
        });
    }
}