這是我第一次使用WebView小部件,並且已經通過Google和StackExchange進行搜索,無法找到解決我的問題的方法。Android - WebView是空白的
我已將WebView放置在FragmentActivity上,由主Activity加載,無論我使用「http://www.google.com」作爲URL還是指定本地.html文件(非常簡單,包含情侶段落,標題和鏈接)。它沒有在下面顯示,但我的AndroidManifest.xml具有INTERNET權限(和EXTERNAL_STORAGE)。
activity_main.xml中:
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:name="com.adamtcarlson.websiteviewer.MainActivityFragment"
tools:context=".MainActivity"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:gravity="center">
<FrameLayout
android:id="@+id/frm_content"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
MainActivity.java:
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.util.Log;
public class MainActivity extends FragmentActivity {
/**
* The Activity's tag.
*/
private static final String Tag = "MainActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Log.v(Tag, "onCreate()");
populateContentFragment(false);
}
private void populateContentFragment(boolean addToBackStack) {
Log.v(Tag, "populateContentFragment()");
Uri uri = Uri.parse("http://www.google.com/");
//Uri uri = Uri.parse("file:///data/app/testpage.html");
Fragment fragment = WebBrowserFragment.newInstance(uri);
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction()
.replace(R.id.frm_content, fragment);
if (addToBackStack) {
fragmentTransaction.addToBackStack(Tag);
}
fragmentTransaction.commit();
}
}
fragment_webbrowser.xml:
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
android:background="#AAAAAA">
<WebView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/wbvBrowser">
</WebView>
</RelativeLayout>
WebBrowserFragment.java:
import android.annotation.SuppressLint;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebView;
import android.webkit.WebViewClient;
/**
* A placeholder fragment containing a simple view.
*/
public class WebBrowserFragment extends Fragment {
private WebView wbvBrowser = null;
private String browserUri = null;
/**
* The Activity's tag.
*/
private static final String Tag = "WebBrowserFragment";
public WebBrowserFragment() {
Bundle args = getArguments();
if (args != null) {
browserUri = args.getString("Uri");
}
}
public static WebBrowserFragment newInstance(Uri uri) {
Log.v(Tag, "newInstance(). Uri: " + uri.toString());
WebBrowserFragment fragment;
if (uri != null) {
fragment = new WebBrowserFragment();
Bundle args = new Bundle();
args.putString("Uri", uri.toString());
fragment.setArguments(args);
}
else {
fragment = new WebBrowserFragment();
}
return fragment;
}
@SuppressLint("SetJavaScriptEnabled")
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
Log.v(Tag, "onCreateView()");
View rootView = inflater.inflate(R.layout.fragment_webbrowser, container, false);
wbvBrowser = (WebView) rootView.findViewById(R.id.wbvBrowser);
wbvBrowser.getSettings().setJavaScriptEnabled(true);
wbvBrowser.setWebViewClient(new WebViewClient() {
public boolean shouldOverrideUrlLoading(WebView view, String url) {
return false;
}
});
wbvBrowser.loadUrl(browserUri);
return rootView;
}
}
我應該在片段中注意到,我試着評論.setWebViewClient()
調用,但那也沒有做任何事。我從一本書中得到了原始代碼,「Android編程:大書呆子牧場指南」。我看不到任何錯誤或任何在logcat日誌上看起來不合適的地方。我已經嘗試使用API 10和19通過模擬器查看應用程序。我也嘗試在我的LG Ultimate 2上安裝.apk,並且都顯示一個空白屏幕(我將背景改爲Fragment的RelativeLayout以灰色確保WebView顯示出來)。
非常感謝您的任何幫助。
哇。我不能相信我錯過了這一點。啊。 謝謝你,我很感激。 – clamum