本文实例为大家分享了Android实现悬浮小火箭效果的具体代码，供大家参考，具体内容如下
思路
使用serivce在后台启动小火箭 小火箭使用windowmanager实现。 用ontoch监听实现小火箭的拖拽。
代码实现
代码语言：javascript复制public class RocketService extends Service {
private WindowManager mWM;
private View view;
private int startX ;
private int startY ;
private LayoutParams params;
@Override
public IBinder onBind(Intent intent) {
return null ;
}
@Override
public void onCreate() {
super .onCreate();
System. out .println("服务创建。。。。" );
mWM = (WindowManager) getSystemService(WINDOW_SERVICE );
winWidth = mWM.getDefaultDisplay(). getWidth();
winHeight = mWM .getDefaultDisplay().getHeight ();
params = new WindowManager.LayoutParams();
params. height = WindowManager.LayoutParams.WRAP_CONTENT ;
params. width = WindowManager.LayoutParams.WRAP_CONTENT ;
params. flags = WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
| WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE ;
params. format = PixelFormat. TRANSLUCENT ;
params. type = WindowManager.LayoutParams.TYPE_PHONE ;
params. gravity = Gravity. LEFT Gravity. TOP;
view = LayoutInflater.from( this).inflate(R.layout. rocket , null );
//拿到 imageview，设置帧动画
ImageView ivRocket = (ImageView) view .findViewById(R.id. rocket);
ivRocket.setImageResource(R.drawable. rocket );
AnimationDrawable drawable = (AnimationDrawable) ivRocket.getDrawable();
drawable.start();
mWM.addView( view, params);
// 设置view的触摸事件，让它可以被拖拽
view.setOnTouchListener( new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent. ACTION_DOWN:
startX = ( int ) event.getRawX();
startY = ( int ) event.getRawY();
break ;
case MotionEvent. ACTION_MOVE:
int dx = (int ) (event.getRawX() - startX );
int dy = (int ) (event.getRawY() - startY );
// 更新浮窗位置
params. x = dx;
params. y = dy;
// 限制窗口坐标不超过屏幕
if (params .x < 0) {
params. x = 0;
}
if (params .x winWidth - view .getWidth()) {
params. x = winWidth - view .getWidth();
}
if (params .y < 0) {
params. y = 0;
}
if (params .y winHeight - view .getHeight()) {
params. y = winHeight - view .getHeight();
}
mWM.updateViewLayout( view, params );
startX = ( int ) event.getRawX();
startY = ( int ) event.getRawY();
break ;
case MotionEvent. ACTION_UP:
// 手指抬起起，需要发射火箭，限定发射火箭的范围
if (params .x 0 && params. x < winWidth
&& params. y winHeight - 500) {
sendRocket();
}
break ;
}
return true ;// 不再把事件传递给onClick处理
}
});
}
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
int y = msg.arg1 ;
params. y = y;
mWM.updateViewLayout( view, params);
}
};
private int winWidth ;
private int winHeight ;
// 发射火箭
private void sendRocket() {
// 用子线程更新y轴
new Thread(new Runnable() {
@Override
public void run() {
int pos = 1000;
for (int i=0; i <= 10; i ) {
int y = pos-100*i;
//休眠100ms发消息
try {
Thread. sleep(100);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Message msg = Message.obtain();
msg. arg1 = y;
mHandler.sendMessage(msg);
}
}
}).start();
}
@Override
public void onDestroy() {
// TODO Auto-generated method stub
super .onDestroy();
if (mWM != null && view != null) {
mWM.removeView( view);
view = null ;
}
}
}以上就是本文的全部内容，希望对大家的学习有所帮助。
