[转载]Android:WebView带划屏手势的浏览器实现

[转载]WebView,带划屏手势的浏览器实现 – bitfairyland – 博客园.

private void showViews() {
// TODO Auto-generated method stub
mGestureDetector = new GestureDetector(this);//实例化手势对象
wv_vm.getSettings().setSupportZoom(true);//启用页面的缩放
wv_vm.getSettings().setBuiltInZoomControls(true);//启用页面缩放的按钮
wv_vm.getSettings().setJavaScriptEnabled(true);//启用javascript支持
wv_vm.loadUrl("http://www.cnblogs.com/pxue/");//加载网址

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

mGestureDetector.setIsLongpressEnabled(true);

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

}

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

private class HelloWebViewClient extends WebViewClient {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
}

@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
// Toast.makeText(this, "onTouch", Toast.LENGTH_SHORT).show();
return mGestureDetector.onTouchEvent(event);
}

重写了划动事件

@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
// TODO Auto-generated method stub
if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE
&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
wv_vm.goBack();
} else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE
&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {

wv_vm.goForward();
}
return false;
}

变量、常量的声明

private GestureDetector mGestureDetector;

private static final int SWIPE_MIN_DISTANCE = 120;
private static final int SWIPE_THRESHOLD_VELOCITY = 200;

3.调用系统拍照功能部分

private void setListensers() {
// TODO Auto-generated method stub
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent, 1);

}

private void findViews() {
// TODO Auto-generated method stub
img_pic=(ImageView)findViewById(R.id.img_pic);

}

protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
if (requestCode == 1)
{
if (resultCode == Activity.RESULT_OK)
{
// 拍照Activity保存图像数据的key是data，返回的数据类型是Bitmap对象
Bitmap cameraBitmap = (Bitmap) data.getExtras().get("data");
// 在ImageView组件中显示拍摄的照片
img_pic.setImageBitmap(cameraBitmap);
}
}
super.onActivityResult(requestCode, resultCode, data);
}