android实现拖动效果

1. 布局文件

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<?xml version = "1.0" encoding = "utf-8" ?>
<LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android"
android:orientation = "vertical" android:layout_width = "fill_parent"
android:layout_height = "fill_parent" >
<Button android:id = "@+id/btn_hello" android:layout_width = "fill_parent"
android:layout_height = "wrap_content" android:text = "@string/hello" />
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical" android:layout_width="fill_parent"android:layout_height="fill_parent"><Button android:id="@+id/btn_hello" android:layout_width="fill_parent"android:layout_height="wrap_content" android:text="@string/hello" /></LinearLayout>

2. 代码

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package com.roiding.sample;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.Button;
public class Touch extends Activity{
/**Calledwhentheactivityisfirstcreated.*/
@Override
public void onCreate(BundlesavedInstanceState){
super .onCreate(savedInstanceState);
setContentView(R.layout.main);
final Buttonbtn=(Button)findViewById(R.id.btn_hello);
btn.setOnTouchListener( new OnTouchListener(){
int []temp= new int []{ 0 , 0 };
public boolean onTouch(Viewv,MotionEventevent){
int eventaction=event.getAction();
Log.i( "&&&" , "onTouchEvent:" +eventaction);
int x=( int )event.getRawX();
int y=( int )event.getRawY();
switch (eventaction){
case MotionEvent.ACTION_DOWN: //touchdownsocheckifthe
temp[ 0 ]=( int )event.getX();
temp[ 1 ]=y-v.getTop();
break ;
case MotionEvent.ACTION_MOVE: //touchdragwiththeball
v.layout(x-temp[ 0 ],y-temp[ 1 ],x+v.getWidth()
-temp[ 0 ],y-temp[ 1 ]+v.getHeight());
v.postInvalidate();
break ;
case MotionEvent.ACTION_UP:
break ;
}
return false ;
}
});
}
}

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