WebView第二次不加载我的HTML？

Question

WebView第二次不加载我的HTML？

我创建了一个小的Activity,它能够在webview中加载两个不同的HTML字符串.当我运行Activity时,它通过从page_1变量加载String来开始.到现在为止还挺好.该页面按预期显示.我添加了一个onFling监听器,它应该使活动加载page_2变量的内容.问题是,即使调用onFling并调用loadUrl,webview也不会更新？

我的活动如下:

import android.app.Activity;
import android.os.Bundle;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.webkit.WebView;

public class Test extends Activity {
private GestureDetector mGestureDetector;
private WebView mWebView;
private int mPageIndex;

private static final String page_1 = "<html><body>Hello page 1</body></html>";
private static final String page_2 = "<html><body>Hello page 2</body></html>";

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.test);
  mWebView = (WebView) findViewById(R.id.webview);
  mWebView.loadData(page_1, "text/html", "utf-8");
  setupGestureDetection();
  mPageIndex = 0;
}

private void setupGestureDetection() {
  mGestureDetector = new GestureDetector(new MyGestureDetector());
  mWebView.setOnTouchListener(new OnTouchListener() {
    public boolean onTouch(View v, MotionEvent event) {
      return mGestureDetector.onTouchEvent(event);
    }
  });
}

class MyGestureDetector extends GestureDetector.SimpleOnGestureListener {
  private static final int SWIPE_DISTANCE_THRESHOLD = 120;
  private static final int SWIPE_VELOCITY_THRESHOLD = 200;

  private boolean isHorizontalSwipe(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
    if (Math.abs(velocityX) > SWIPE_VELOCITY_THRESHOLD) {
      if (Math.abs(e1.getX() - e2.getX()) > SWIPE_DISTANCE_THRESHOLD) {
        return true;
      }
    }
    return false;
}

@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
  if (isHorizontalSwipe(e1, e2, velocityX, velocityY)) {
    if (e1.getX() > e2.getX()) {
      // Right to left
      if (++mPageIndex % 2 == 0) {
        mWebView.loadData(page_1, "text/html", "utf-8");
      } else {
        mWebView.loadData(page_2, "text/html", "utf-8");
      }
      return true;
    }
  }
  return false;
}
}
}

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我的布局看起来像这样:

<?xml version="1.0" encoding="utf-8"?>
<WebView xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/webview"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent" />

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我希望有一个人可以帮助我!:-)

最好的祝福

Stig Andersen

Answer 1

Jen*_*ens 10

首先,尽量避免WebView#loadData(String, String, String)像瘟疫一样 - 这是一个错误的位置使用WebView#loadDataWithBaseURL(String, String, String, String, String)而不是.

此外,这将解决您的问题.反直觉我知道,但是,嘿,这是Android的方式.

    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
        if (isHorizontalSwipe(e1, e2, velocityX, velocityY)) {
            if (e1.getX() > e2.getX()) {
                // Right to left
                if (++mPageIndex % 2 == 0) {
                    mWebView.loadDataWithBaseURL(null, page_1, null, "utf-8", null);
                } else {
                    mWebView.loadDataWithBaseURL(null, page_2, null, "utf-8", null);
                }
                // Seriously. You must return false for the loadDataWithBaseURL to work. Not kidding. So you could skip this return.
                return false;
            }
        }
        return false;
    }

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