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I've created a small Activity which is capable of loading two different HTML strings in a webview. When I run the Activity it starts by loading the String from the page_1 variable. So far so good. The page shows as expected. I've added an onFling listener which should make the activity load the content of the page_2 variable. The problem is that even though the onFling is called and the loadUrl is called the webview isn't updated?
My activity looks like this:
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;
}
}
}
My layout looks like this:
<?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" />
I hope someone can help me! :-)
Best regards
Stig Andersen
942
Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project. Step 2 − Add the following code to res/layout/activity_main. xml. In the above code, we have taken web view to show html content.
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First, try to avoid WebView#loadData(String, String, String) like the plague - it's a buggy p.o.s. Use WebView#loadDataWithBaseURL(String, String, String, String, String) instead.
Further, this will fix your problem. Counter-intuitive I know, but hey, it's the Android way.
@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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