0
我迷路了，但嘗試在Android的世界。應用程序首先在仿真器和實際設備上運行良好。但只要我使用webview進行活動，應用程序就會立即崩潰，無論是在設備上還是模擬器上。任何人都可以發現問題嗎？ （它甚至在我的代碼？）簡單的webView不斷崩潰的應用程序
AutosActivity.java：
package com.cyclist.cyclist;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.os.Build;
import android.webkit.WebView;
public class AutosActivity extends ActionBarActivity {
WebView webView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_autos);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
webView = (WebView) findViewById(R.id.webView1);
webView.loadUrl("http://www.example.com");
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.autos, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_autos,
container, false);
return rootView;
}
}
}
fragment_autos.xml：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.cyclist.cyclist.AutosActivity$PlaceholderFragment" >
<WebView
android:id="@+id/webView1"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</RelativeLayout>
清單：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.cyclist.cyclist"
android:versionCode="1"
android:versionName="1.0" >
<uses-permission android:name="android.permission.INTERNET" />
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="19" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.cyclist.cyclist.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.cyclist.cyclist.AutosActivity"
android:label="@string/title_activity_autos"
android:parentActivityName="com.cyclist.cyclist.MainActivity" >
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.cyclist.cyclist.MainActivity" />
</activity>
</application>
</manifest>
logcat的結果顯示如下：
04-03 13:59:12.120: E/AndroidRuntime(24267): FATAL EXCEPTION: main
04-03 13:59:12.120: E/AndroidRuntime(24267): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.cyclist.cyclist/com.cyclist.cyclist.AutosActivity}: java.lang.NullPointerException
04-03 13:59:12.120: E/AndroidRuntime(24267): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1696)
04-03 13:59:12.120: E/AndroidRuntime(24267): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1716)
04-03 13:59:12.120: E/AndroidRuntime(24267): at android.app.ActivityThread.access$1500(ActivityThread.java:124)
04-03 13:59:12.120: E/AndroidRuntime(24267): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:968)
04-03 13:59:12.120: E/AndroidRuntime(24267): at android.os.Handler.dispatchMessage(Handler.java:99)
04-03 13:59:12.120: E/AndroidRuntime(24267): at android.os.Looper.loop(Looper.java:130)
04-03 13:59:12.120: E/AndroidRuntime(24267): at android.app.ActivityThread.main(ActivityThread.java:3806)
04-03 13:59:12.120: E/AndroidRuntime(24267): at java.lang.reflect.Method.invokeNative(Native Method)
04-03 13:59:12.120: E/AndroidRuntime(24267): at java.lang.reflect.Method.invoke(Method.java:507)
04-03 13:59:12.120: E/AndroidRuntime(24267): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
04-03 13:59:12.120: E/AndroidRuntime(24267): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
04-03 13:59:12.120: E/AndroidRuntime(24267): at dalvik.system.NativeStart.main(Native Method)
04-03 13:59:12.120: E/AndroidRuntime(24267): Caused by: java.lang.NullPointerException
04-03 13:59:12.120: E/AndroidRuntime(24267): at com.cyclist.cyclist.AutosActivity.onCreate(AutosActivity.java:29)
04-03 13:59:12.120: E/AndroidRuntime(24267): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
04-03 13:59:12.120: E/AndroidRuntime(24267): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1660)
04-03 13:59:12.120: E/AndroidRuntime(24267): ... 11 more
如果還有其他東西可以幫助我讓我知道。 TIA
編輯：
和
activity_auto.xml：
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.cyclist.cyclist.AutosActivity"
tools:ignore="MergeRootFrame" />
[試着問短的，獨立的，正確的（可編譯）問題，不貼你的整個代碼庫（http://www.sscce.org/） –