Android 可拖动浮动工具条（菜单）Demo

package com.flys.floatbar; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import com.flys.floatbar.R; import android.app.Activity; import android.os.Bundle; import android.util.DisplayMetrics; import android.view.MotionEvent; import android.view.View; import android.view.View.OnTouchListener; import android.widget.GridView; import android.widget.ImageView; import android.widget.SimpleAdapter; import android.widget.Toast; public class FloatBarActivity extends Activity implements OnTouchListener{ private GridView gv; private ImageView iv; private SimpleAdapter adapter; private List <HashMap<String,Integer>>data; DisplayMetrics dm ; private int screenWidth; private int screenHeight; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); dm = getResources().getDisplayMetrics(); screenWidth = dm.widthPixels; screenHeight = dm.heightPixels - 50; gv = (GridView) this.findViewById(R.id.show_gv); iv = (ImageView) this.findViewById(R.id.show_iv); gv.setOnTouchListener(this); gv.bringToFront();//将工具条GridView显示最前（要不然怎么叫浮动） data = new ArrayList<HashMap<String,Integer>>(); HashMap<String,Integer> map = new HashMap<String,Integer>(); for(int i = 0; i < 3 ; i++){ map.put("image", R.drawable.ic_menu_manage); data.add(map); } adapter = new SimpleAdapter(this, data, R.layout.item, new String[]{"image"}, new int[]{R.id.show_iv}); gv.setAdapter(adapter); } int lastX, lastY; @Override public boolean onTouch(View v, MotionEvent event) { int ea = event.getAction(); switch (ea) { case MotionEvent.ACTION_DOWN: lastX = (int) event.getRawX();// 获取触摸事件触摸位置的原始X坐标 lastY = (int) event.getRawY(); break; case MotionEvent.ACTION_MOVE: int dx = (int) event.getRawX() - lastX; int dy = (int) event.getRawY() - lastY; int l = v.getLeft() + dx; int b = v.getBottom() + dy; int r = v.getRight() + dx; int t = v.getTop() + dy; // 下面判断移动是否超出屏幕 if (l < 0) { l = 0; r = l + v.getWidth(); } if (t < 0) { t = 0; b = t + v.getHeight(); } if (r > screenWidth) { r = screenWidth; l = r - v.getWidth(); } if (b > screenHeight) { b = screenHeight; t = b - v.getHeight(); } v.layout(l, t, r, b); lastX = (int) event.getRawX(); lastY = (int) event.getRawY(); Toast.makeText(FloatBarActivity.this, "当前位置：" + l + "," + t + "," + r + "," + b, Toast.LENGTH_SHORT).show(); v.postInvalidate(); break; case MotionEvent.ACTION_UP: break; } return false; } }