Android:WebView带划屏手势的浏览器实现

写了简单Android环境下基于webview的浏览器，实现划屏切换页面的手势，在一个activity里webview的缓冲内切换的。并测试下调用系统拍照的功能

MVC模式（Model-View-Controller）

1.WebView的设置部分

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private void showViews() { 

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// TODO Auto-generated method stub 

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mGestureDetector = new GestureDetector(this);//实例化手势对象 

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wv_vm.getSettings().setSupportZoom(true);//启用页面的缩放 

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wv_vm.getSettings().setBuiltInZoomControls(true);//启用页面缩放的按钮 

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wv_vm.getSettings().set<SPAN class=wp_keywordlink_affiliate><A title=JavaScript href="http://www.mikel.cn/category/%e5%bc%80%e5%8f%91%e7%ac%94%e8%ae%b0/javascript" target=_blank>JavaScript</A></SPAN>Enabled(true);//启用<SPAN class=wp_keywordlink_affiliate><A title=JavaScript href="http://www.mikel.cn/category/%e5%bc%80%e5%8f%91%e7%ac%94%e8%ae%b0/javascript" target=_blank>JavaScript</A></SPAN>支持 

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wv_vm.loadUrl("http://www.cnblogs.com/pxue/");//加载网址 

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wv_vm.setOnTouchListener(this);//监听触摸事件 

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wv_vm.setClickable(true); 

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wv_vm.setLongClickable(true); 

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mGestureDetector.setIsLongpressEnabled(true); 

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wv_vm.setWebViewClient(new HelloWebViewClient());//实现点击加载页面在本webview内载入 

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wv_vm.setFocusable(true); 

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wv_vm.requestFocus(); 

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}

在WebView加载新开的页面，是重写了Android.webkit.WebViewClient

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private class HelloWebViewClient extends WebViewClient { 

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@Override

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public boolean shouldOverrideUrlLoading(WebView view, String url) { 

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view.loadUrl(url); 

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return true; 

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} 

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}

2.划屏手势部分

监听触摸时间传给手势对象

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@Override

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public boolean onTouch(View v, MotionEvent event) { 

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// TODO Auto-generated method stub 

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// Toast.makeText(this, "onTouch", Toast.LENGTH_SHORT).show(); 

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return mGestureDetector.onTouchEvent(event); 

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}

重写了划动事件

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@Override

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public boolean onFling(MotionEvent e1, MotionEvent e2, float <SPAN class=wp_keywordlink_affiliate><A title=Velocity href="http://www.mikel.cn/tag/velocity/" target=_blank>Velocity</A></SPAN>X, 

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float <SPAN class=wp_keywordlink_affiliate><A title=Velocity href="http://www.mikel.cn/tag/velocity/" target=_blank>Velocity</A></SPAN>Y) { 

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// TODO Auto-generated method stub 

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if (e1.getX() - e2.getX() &gt; SWIPE_MIN_DISTANCE 

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&amp;&amp; Math.abs(<SPAN class=wp_keywordlink_affiliate><A title=Velocity href="http://www.mikel.cn/tag/velocity/" target=_blank>Velocity</A></SPAN>X) &gt; SWIPE_THRESHOLD_VELOCITY) { 

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wv_vm.goBack(); 

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} else if (e2.getX() - e1.getX() &gt; SWIPE_MIN_DISTANCE 

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&amp;&amp; Math.abs(velocityX) &gt; SWIPE_THRESHOLD_VELOCITY) { 

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wv_vm.goForward(); 

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} 

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return false; 

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}

变量、常量的声明

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private GestureDetector mGestureDetector; 

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private static final int SWIPE_MIN_DISTANCE = 120; 

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private static final int SWIPE_THRESHOLD_VELOCITY = 200;

3.调用系统拍照功能部分

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private void setListensers() { 

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// TODO Auto-generated method stub 

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Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 

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startActivityForResult(intent, 1); 

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} 

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private void findViews() { 

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// TODO Auto-generated method stub 

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img_pic=(ImageView)findViewById(R.id.img_pic); 

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} 

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protected void onActivityResult(int requestCode, int resultCode, Intent data) 

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{ 

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if (requestCode == 1) 

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{ 

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if (resultCode == Activity.RESULT_OK) 

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{ 

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// 拍照Activity保存图像数据的key是data，返回的数据类型是Bitmap对象 

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Bitmap cameraBitmap = (Bitmap) data.getExtras().get("data"); 

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// 在ImageView组件中显示拍摄的照片 

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img_pic.setImageBitmap(cameraBitmap); 

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} 

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} 

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super.onActivityResult(requestCode, resultCode, data); 

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}