Question

我很难用我的应用程序运行webview，因为它正确地崩溃了应用程序。

爪哇

package com.unext.unextlibrary;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.Bundle;
import android.view.Window;
import android.webkit.JavascriptInterface;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;


  @SuppressLint("SetJavaScriptEnabled")
   public class InitializeVideo extends Activity {

WebView mWebview;

@Override
@JavascriptInterface
public void onCreate(Bundle icicle) {
    setContentView(R.layout.activity_video_play);

    getWindow().requestFeature(Window.FEATURE_PROGRESS);
    mWebview  = new WebView(this);

    mWebview.getSettings().setJavaScriptEnabled(true); // enable javascript

    final Activity activity = this;

    mWebview.setWebViewClient(new WebViewClient() {
        public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
            Toast.makeText(activity, description, Toast.LENGTH_SHORT).show();
        }
    });

    mWebview .loadUrl("http://www.google.com");
    setContentView(mWebview );
}
}

XML CODE

<?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#000000"
android:orientation="vertical" >

 <android.webkit.WebView android:id="@+id/WebView"
    android:layout_width="fill_parent" android:layout_height="fill_parent">
</android.webkit.WebView>

</LinearLayout>

在我的清单中，我将sdk版本定位为17

Manifest到这里

<uses-sdk
    android:minSdkVersion="14"
    android:targetSdkVersion="17" />

  <uses-permission android:name="android.permission.INTERNET"/>

 <activity
        android:theme="@style/Theme.Video"
        android:configChanges="orientation|screenSize"
        android:name="com.unext.unextlibrary.InitializeVideo"
        android:label="@string/app_name" >
     </activity>

我的logcat输出也显示如下

01-24 07:11:09.091: E/AndroidRuntime(2457): FATAL EXCEPTION: main
    01-24 07:11:09.091: E/AndroidRuntime(2457): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.unext.unextlibrary/com.unext.unextlibrary.InitializeVideo}: android.util.AndroidRuntimeException: requestFeature() must be called before adding content
    01-24 07:11:09.091: E/AndroidRuntime(2457):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
    01-24 07:11:09.091: E/AndroidRuntime(2457):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
    01-24 07:11:09.091: E/AndroidRuntime(2457):     at android.app.ActivityThread.access$600(ActivityThread.java:141)
    01-24 07:11:09.091: E/AndroidRuntime(2457):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
    01-24 07:11:09.091: E/AndroidRuntime(2457):     at android.os.Handler.dispatchMessage(Handler.java:99)
    01-24 07:11:09.091: E/AndroidRuntime(2457):     at android.os.Looper.loop(Looper.java:137)
    01-24 07:11:09.091: E/AndroidRuntime(2457):     at android.app.ActivityThread.main(ActivityThread.java:5039)
    01-24 07:11:09.091: E/AndroidRuntime(2457):     at java.lang.reflect.Method.invokeNative(Native Method)
    01-24 07:11:09.091: E/AndroidRuntime(2457):     at java.lang.reflect.Method.invoke(Method.java:511)
    01-24 07:11:09.091: E/AndroidRuntime(2457):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
    01-24 07:11:09.091: E/AndroidRuntime(2457):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
    01-24 07:11:09.091: E/AndroidRuntime(2457):     at dalvik.system.NativeStart.main(Native Method)
    01-24 07:11:09.091: E/AndroidRuntime(2457): Caused by: android.util.AndroidRuntimeException: requestFeature() must be called before adding content
    01-24 07:11:09.091: E/AndroidRuntime(2457):     at com.android.internal.policy.impl.PhoneWindow.requestFeature(PhoneWindow.java:229)
    01-24 07:11:09.091: E/AndroidRuntime(2457):     at com.unext.unextlibrary.InitializeVideo.onCreate(InitializeVideo.java:24)
    01-24 07:11:09.091: E/AndroidRuntime(2457):     at android.app.Activity.performCreate(Activity.java:5104)
    01-24 07:11:09.091: E/AndroidRuntime(2457):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
    01-24 07:11:09.091: E/AndroidRuntime(2457):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
    01-24 07:11:09.091: E/AndroidRuntime(2457):     ... 11 more

Answer 1

尝试更改如下：

的setContentView（R.layout.activity_video_play）; 。getWindow（）requestFeature（Window.FEATURE_PROGRESS）;

改为使用这种方式：

getWindow（）requestFeature（Window.FEATURE_PROGRESS）。的setContentView（R.layout.activity_video_play）;

Answer 2

试试这种方式，

public void onCreate(Bundle icicle) {
getWindow().requestFeature(Window.FEATURE_PROGRESS);
    setContentView(R.layout.activity_video_play);

因为，在调用setContentView();

之前必须调用requestFeature（）

Answer 3

您的代码

public void onCreate(Bundle icicle) {
    setContentView(R.layout.activity_video_play);

现在把注释这个setContentView（）语句作为不需要添加新语句

public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    //setContentView(R.layout.activity_video_play);

由于必须在设置内容视图之前设置另一个窗口功能的请求，因此为您正在使用它的内容视图准备了窗口。另一点是您使用了setContentView()的布局，或者只是将单个组件放入其中，因为您使用的是首先使用的布局，然后最后设置webview这已经覆盖了{{1}的布局}

Answer 4

也不要忘记在android清单文件中使用"android:hardwareAccelerated=true"

特别适用于Android 4及以上版本。

Android WebView在Android 4.0 +上崩溃了应用程序

4 个答案: