Android實現(xiàn)帶磁性的懸浮窗體效果

更新時間：2016年07月08日 11:41:37 作者：manymore13

這篇文章主要介紹了Android實現(xiàn)帶磁性的懸浮窗體效果,涉及Android針對窗體的動態(tài)操作相關(guān)技巧,具有一定參考借鑒價值,需要的朋友可以參考下

本文實例講述了Android實現(xiàn)帶磁性的懸浮窗體效果。分享給大家供大家參考，具體如下：

帶磁性的懸浮窗體，類似于360綠色小人

主要實現(xiàn)的是:

1.懸浮所有窗體之上
2.有吸引力，吸附于屏幕邊上
3.有點擊效果

下面我就實現(xiàn)上面三點，簡單封裝了個FloatView

先看下本次Demo的效果圖，然后再看代碼，

效果圖：

FloatView代碼如下

package com.manymore13.flowwindowdemo;
import android.content.Context;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.WindowManager;
import android.view.WindowManager.LayoutParams;
import android.widget.ImageView;
/**
 * @author manymore13
 * @version 1.0
 */
public class FloatView extends ImageView{
  private float mTouchX;
  private float mTouchY;
  private float x;
  private float y;
  private int startX;
  private int startY;
  private Context c;
  private int imgId = R.drawable.ic_launcher;
  private int controlledSpace = 20;
  private int screenWidth;
  boolean isShow = false;
  private OnClickListener mClickListener;
  private WindowManager windowManager ;
  private WindowManager.LayoutParams windowManagerParams = new WindowManager.LayoutParams();
  public FloatView(Context context, AttributeSet attrs) {
    super(context, attrs);
  }
  public FloatView(Context c)
  {
    super(c);
    initView(c);
  }
  // 初始化窗體
  public void initView(Context c)
  {
    windowManager = (WindowManager) c.getApplicationContext().getSystemService(Context.WINDOW_SERVICE);
    screenWidth = windowManager.getDefaultDisplay().getWidth();
    this.setImageResource(imgId);
    windowManagerParams.type = LayoutParams.TYPE_PHONE;
    windowManagerParams.format = PixelFormat.RGBA_8888; // 背景透明
    windowManagerParams.flags = LayoutParams.FLAG_NOT_TOUCH_MODAL
        | LayoutParams.FLAG_NOT_FOCUSABLE;
    // 調(diào)整懸浮窗口至左上角，便于調(diào)整坐標(biāo)
    windowManagerParams.gravity = Gravity.LEFT | Gravity.TOP;
    // 以屏幕左上角為原點，設(shè)置x、y初始值
    windowManagerParams.x = 0;
    windowManagerParams.y = 200;
    // 設(shè)置懸浮窗口長寬數(shù)據(jù)
    windowManagerParams.width = LayoutParams.WRAP_CONTENT;
    windowManagerParams.height = LayoutParams.WRAP_CONTENT;
  }
  public void setImgResource(int id)
  {
    imgId = id;
  }
  @Override
  public boolean onTouchEvent(MotionEvent event) {
    x = event.getRawX();
    y = event.getRawY();
    switch(event.getAction())
    {
      case MotionEvent.ACTION_DOWN:
      {
        mTouchX = event.getX();
        mTouchY = event.getY();
        startX = (int) event.getRawX();
        startY = (int) event.getRawY();
        break;
      }
      case MotionEvent.ACTION_MOVE:
      {
        updateViewPosition();
        break;
      }
      case MotionEvent.ACTION_UP:
      {
        if(Math.abs(x - startX) < controlledSpace && Math.abs(y - startY) < controlledSpace)
        {
          if(mClickListener != null)
          {
            mClickListener.onClick(this);
          }
        }
        Log.i("tag", "x="+x+" startX+"+startX+" y="+y+" startY="+startY);
        if(x <= screenWidth/2)
        {
          x = 0;
        }else{
          x = screenWidth;
        }
        updateViewPosition();
        break;
      }
    }
    return super.onTouchEvent(event);
  }
  // 隱藏該窗體
  public void hide()
  {
    if(isShow)
    {
      windowManager.removeView(this);
      isShow = false;
    }
  }
  // 顯示該窗體
  public void show()
  {
    if(isShow == false)
    {
      windowManager.addView(this, windowManagerParams);
      isShow = true;
    }
  }
  @Override
  public void setOnClickListener(OnClickListener l) {
     this.mClickListener = l;
  }
  private void updateViewPosition() {
     // 更新浮動窗口位置參數(shù)
     windowManagerParams.x = (int) (x - mTouchX);
     windowManagerParams.y = (int) (y - mTouchY);
     windowManager.updateViewLayout(this, windowManagerParams); // 刷新顯示
  }
}

完整實例代碼點擊此處本站下載。

如果需要用上面的類可以這樣做

floatView = new FloatView(this); // 創(chuàng)建窗體
floatView.setOnClickListener(this); // 設(shè)置事件，你需要實現(xiàn)FloatView里的onclick接口
floatView.show(); // 顯示該窗體
floatView.hide(); // 隱藏窗體

PS 不要忘記在manifest里加上權(quán)限（更多manifest功能與權(quán)限可參考本站：Android Manifest功能與權(quán)限描述大全：http://tools.jb51.net/table/AndroidManifest）

上面有個bug 就是點擊的時候view下移

public int getStatusBarHeight() {
    int titleBarHeight = 0;
    Rect frame = new Rect();
    mAct.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
    titleBarHeight = frame.top;
    if (titleBarHeight == 0) {
      int resourceId = getResources().getIdentifier("status_bar_height", "dimen", "android");
      if (resourceId > 0) {
        titleBarHeight = getResources().getDimensionPixelSize(resourceId);
      }
    }
    return titleBarHeight;
}