实现图片的拖拽效果
最近项目里有个模块需要实现拖拽，分析了，发现在不同层内拖拽效果很难实现，要么就是效果体验性很一般。
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好不容易用了障眼法才解决，呵呵，分享下。
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package com.nico;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.PixelFormat;import android.os.Bundle;import android.view.Gravity;import android.view.MotionEvent;import android.view.View;import android.view.Window;import android.view.WindowManager;import android.view.View.OnTouchListener;import android.widget.ImageView;public class DragActivity extends Activity {ImageView imgview;/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);final ImageView img = (ImageView) findViewById(R.id.img);final WindowManager wm = this.getWindowManager();final WindowManager.LayoutParams wlayout = new WindowManager.LayoutParams();wlayout.gravity = Gravity.TOP;wlayout.x = 0;wlayout.y = 0;wlayout.height = WindowManager.LayoutParams.WRAP_CONTENT;wlayout.width = WindowManager.LayoutParams.WRAP_CONTENT;wlayout.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE| WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE| WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON| WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN;wlayout.format = PixelFormat.TRANSLUCENT;wlayout.windowAnimations = 0;img.setOnTouchListener(new OnTouchListener() {@Overridepublic boolean onTouch(View v, MotionEvent event) {int act = event.getAction();int rawx = (int) event.getRawX()-v.getRight()-v.getWidth();int rawy = (int) event.getRawY();wlayout.x = rawx;wlayout.y = rawy;switch (act) {case MotionEvent.ACTION_DOWN:ImageView newimg = new ImageView(DragActivity.this);img.setDrawingCacheEnabled(true);Bitmap bt = img.getDrawingCache();newimg.setImageBitmap(bt);imgview = newimg;wm.addView(imgview, wlayout);imgview.setVisibility(View.VISIBLE);break;case MotionEvent.ACTION_MOVE://wlayout.x = rawx;//wlayout.y = rawy;wm.updateViewLayout(imgview, wlayout);break;case MotionEvent.ACTION_UP:wm.removeView(imgview);if (imgview != null) {imgview.destroyDrawingCache();imgview = null;}break;}return true;}});}}?
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1 楼 antoon.nee 2010-11-29 楼主，你好。