一、前言：

模拟触屏事件需要两个步骤，一是获得事件对象MotionEvent，二是分发该事件对象。

1.获得事件对象MotionEvent

获得一个MotionEvent对象,这里我们使用MotionEvent的obtain()方法,参数如下

    MotionEvent.obtain(downTime, eventTime, action, x, y, metaState);

举个例子:
onTouch(mPageView, MotionEvent.obtain(0, 0, MotionEvent.ACTION_DOWN, screenWidth / 2, screenHeight / 2, 0));
就表示在屏幕中间模拟一次ACTION_DOWN事件

2.分发该事件对象

//这个方法用来分发MotionEvent
public boolean dispatchTouchEvent(MotionEvent ev)  

二、示例：

下面这个示例程序的流程是点击一个button然后触发一个EditText的获取焦点事件

1、布局文件showime.xml：

    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
       android:layout_width="fill_parent"
       android:layout_height="fill_parent"
       android:orientation="vertical">
                   
        <Button android:id="@+id/ButtonIME"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="5px"
            android:text="弹出软键盘输入法" />
           
               
        <EditText android:id="@+id/EditTextIME"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="5px"
            android:text="显示输入法键盘"/>
       
    </LinearLayout>

2、Activity，ShowIME.java文件源码：

    package org.shuxiang.test;
       
    import android.app.Activity;
    import android.os.Bundle;
    import android.os.Handler;
    import android.os.Looper;
    import android.os.Message;
    import android.os.SystemClock;
    import android.view.MotionEvent;
    import android.view.View;
    import android.view.Window;
    import android.view.View.OnClickListener;
    import android.widget.Button;
    import android.widget.EditText;
       
    public class ShowIME  extends Activity
    {
        private EditText et;
        private Button bt;
        private static Handler messageHandler;
           
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            requestWindowFeature(Window.FEATURE_NO_TITLE);
            setContentView(R.layout.showime);
               
            bt = (Button) findViewById(R.id.ButtonIME);
            bt.setOnClickListener(new OnClickListener()
            {
                @Override
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    et.dispatchTouchEvent(MotionEvent.obtain(SystemClock.uptimeMillis(), SystemClock.uptimeMillis(), MotionEvent.ACTION_DOWN, et.getLeft()+5, et.getTop()+5, 0));
                    et.dispatchTouchEvent(MotionEvent.obtain(SystemClock.uptimeMillis(), SystemClock.uptimeMillis(), MotionEvent.ACTION_UP, et.getLeft()+5, et.getTop()+5, 0));
                }
            });        
            et = (EditText) findViewById(R.id.EditTextIME);
               
               
            Looper looper = Looper.myLooper();
            messageHandler = new MessageHandler(looper);        
            //此处的作用是延迟1秒，然后激活点击事件
            //欢迎转载并说明转自：http://www.jcodecraeer.com/a/anzhuokaifa/androidkaifa/2013/0111/799.html
            new Thread()
            {
                @Override
                public void run()
                {
                    synchronized(this)
                    {
                        try
                        {
                            wait(1000); //1秒
                        }
                        catch (InterruptedException e)
                        {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                    }
                    Message message = Message.obtain();
                    message.what = 1;
                    messageHandler.sendMessage(message);
                }
            }.start();        
        }
           
        class MessageHandler extends Handler
        {
            public MessageHandler(Looper looper)
            {
                super(looper);
            }
            @Override
            public void handleMessage(Message msg)
            {
                Bundle bundle = msg.getData();
                switch (msg.what)
                {
                case 1:
                    //模拟点击按钮
                    bt.dispatchTouchEvent(MotionEvent.obtain(SystemClock.uptimeMillis(), SystemClock.uptimeMillis(), MotionEvent.ACTION_DOWN, et.getLeft()+5, et.getTop()+5, 0));
                    bt.dispatchTouchEvent(MotionEvent.obtain(SystemClock.uptimeMillis(), SystemClock.uptimeMillis(), MotionEvent.ACTION_UP, et.getLeft()+5, et.getTop()+5, 0));
                       
                    //以下代码模拟点击文本编辑框
                    //et.dispatchTouchEvent(MotionEvent.obtain(SystemClock.uptimeMillis(), SystemClock.uptimeMillis(), MotionEvent.ACTION_DOWN, et.getLeft()+5, et.getTop()+5, 0));
                    //et.dispatchTouchEvent(MotionEvent.obtain(SystemClock.uptimeMillis(), SystemClock.uptimeMillis(), MotionEvent.ACTION_UP, et.getLeft()+5, et.getTop()+5, 0));
                    break;
                default:
                    break;
                }
                   
            }
        }
    }

参考链接：http://www.jcodecraeer.com/a/anzhuokaifa/androidkaifa/2013/0111/799.html