Android手机可返回主界面的可移动浮动小窗口
http://blog.sina.com.cn/s/blog_46c97a9d0100y7eb.html
早上醒来在床上拿手机开了“天天动听”边听歌边玩，突然感觉“天天动听”的后台做得真的很酷，可以在桌面用手指随意移动它的窗口，还可以轻触点击它回到程序主窗口！然后想起前几天看到的Android浮动窗口实现，不知道这个“点击返回主界面”能不能也在Android实现呢！！！
想到就动手，马上爬起床。。。。
经过多次调试。。。
然后就有了下面的代码！！！
嘿嘿~~~~成功啦！！！![[转载]Android手机可返回主界面的可移动浮动小窗口](http://www.sinaimg.cn/uc/myshow/blog/misc/gif/E___6860EN00SIGG.gif "[转载]Android手机可返回主界面的可移动浮动小窗口")
我在别人的代码上修改还有增加了点功能
程序首先进入主界面，然后按手机的“home”键退出主界面；然后创建小窗口，可以用手指移动窗口，长按小窗口1500毫秒会销毁小窗口并返回程序主界面，实现了“点击返回主界面”的功能！
给几张截图^__^
有三个类分三个文件存放：
第一个是：MyFloatViewActivity.java
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package fazai.wensi;
import net.xsmile.fv.R;
import android.app.Activity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.WindowManager;
public class MyFloatViewActivity extends Activity {
WindowManager wm=null;
WindowManager.LayoutParams wmParams=null;
MyFloatView myFV=null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
@Override
public void onStop(){
super.onStop();
createView();
}
@Override
public void onRestart(){
super.onRestart();
wm.removeView(myFV);
}
private void createView(){
myFV=new MyFloatView(getApplicationContext(),this);
myFV.setImageResource(R.drawable.icon);
//获取WindowManager
wm=(WindowManager)getApplicationContext().getSystemService("window");
//设置LayoutParams(全局变量）相关参数
wmParams = ((MyApplication)getApplication()).getMywmParams();
wmParams.type=2002;
wmParams.flags|=8;
wmParams.gravity=Gravity.LEFT|Gravity.TOP; //调整悬浮窗口至左上角
//以屏幕左上角为原点，设置x、y初始值
wmParams.x=0;
wmParams.y=0;
//设置悬浮窗口长宽数据
wmParams.width=50;
wmParams.height=50;
//显示myFloatView图像
wm.addView(myFV, wmParams);
}
@Override
public void onDestroy(){
super.onDestroy();
//在程序退出(Activity销毁）时销毁悬浮窗口
wm.removeView(myFV);
}
}
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第二个是：MyApplication.java
--------------------------------------------------------------------------------------
package fazai.wensi;
import android.app.Application;
import android.view.WindowManager;
public class MyApplication extends Application {
private WindowManager.LayoutParams wmParams=new WindowManager.LayoutParams();
public WindowManager.LayoutParams getMywmParams(){
return wmParams;
}
}
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第三个是：MyFloatView.java
--------------------------------------------------------------------------------------
package fazai.wensi;
import java.util.Timer;
import java.util.TimerTask;
import android.content.Context;
import android.content.Intent;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.MotionEvent;
import android.view.WindowManager;
import android.widget.ImageView;
public class MyFloatView extends ImageView {
private float mTouchStartX;
private float mTouchStartY;
private float x;
private float y;
public Timer timer;
int state;
MyFloatViewActivity my;//引用Activity
//对窗口的引用，为下面的窗口移动提供引用
private WindowManager wm=(WindowManager)getContext().getApplicationContext().getSystemService("window");
private WindowManager.LayoutParams wmParams = ((MyApplication)getContext().getApplicationContext()).getMywmParams();
public MyFloatView(Context context,MyFloatViewActivity my) {
super(context);
this.my=my;//传入引用
// TODO Auto-generated constructor stub
}
@Override
public boolean onTouchEvent(MotionEvent event) {
//获取相对屏幕的坐标，即以屏幕左上角为原点
x = event.getRawX();
y = event.getRawY()-25; //25是系统状态栏的高度
Log.i("currP", "currX"+x+"====currY"+y);//调试信息
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
state = MotionEvent.ACTION_DOWN;
panTime();
//获取相对View的坐标，即以此View左上角为原点
mTouchStartX = event.getX();
mTouchStartY = event.getY();
Log.i("startP", "startX"+mTouchStartX+"====startY"+mTouchStartY);//调试信息
break;
case MotionEvent.ACTION_MOVE:
state =MotionEvent.ACTION_MOVE;
updateViewPosition();
break;
case MotionEvent.ACTION_UP:
state = MotionEvent.ACTION_UP;
updateViewPosition();
mTouchStartX=mTouchStartY=0;
break;
}
return true;
}
private void panTime(){
final Handler handler=new Handler(){
public void handleMessage(Message msg){
switch(msg.what){
case 1:
Log.i("11111111111","jjjjjjjjjjjjjjjjjjjj");//调试信息
timer.cancel(); //取消定时
Intent intent = my.getIntent(); //为了重启Activity返回Intent
my.finish(); //关闭Activity
my.startActivity(intent); //重启Activity
break;
case 2:
Log.i("22222222222","22222222222222222222");//调试信息
timer.cancel();
break;
}
super.handleMessage(msg);
}
};
TimerTask task=new TimerTask(){
public void run(){
Message message=new Message();
if(state == MotionEvent.ACTION_DOWN){
message.what=1;
}else {
message.what=2;
}
handler.sendMessage(message);
}
};
timer=new Timer();
timer.schedule(task,1500); //定时
}
private void updateViewPosition(){
//更新浮动窗口位置参数
wmParams.x=(int)( x-mTouchStartX);
wmParams.y=(int) (y-mTouchStartY);
wm.updateViewLayout(this, wmParams);
}
}
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其实还可以实现在小窗口内提示信息的，就像“QQ”“飞信”来信息会闪烁图片那样，只要在后台开个线程，然后每隔一段时间更换小窗口的图片就可以
