FragmentActivity上ActionBar上的空指针异常 [英] Null pointer exception on ActionBar at FragmentActivity
本文介绍了FragmentActivity上ActionBar上的空指针异常的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我在运行时收到此错误。
I am getting this Error at runtime.
java.lang.RuntimeException:无法恢复活动
java.lang .NullPointerException:尝试在null
对象引用上调用虚方法'void
android.app.ActionBar.setDisplayShowHomeEnabled(boolean)'
java.lang.RuntimeException: Unable to resume activity java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.ActionBar.setDisplayShowHomeEnabled(boolean)' on a null object reference
StackTrace:
01-22 06:32:55.509: E/AndroidRuntime(3728): FATAL EXCEPTION: main
01-22 06:32:55.509: E/AndroidRuntime(3728): Process: com.qrme.quranmadeeasy, PID: 3728
01-22 06:32:55.509: E/AndroidRuntime(3728): java.lang.RuntimeException: Unable to resume activity {com.qrme.quranmadeeasy/com.qrme.quranmadeeasy.InnerPageActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.ActionBar.setDisplayShowHomeEnabled(boolean)' on a null object reference
01-22 06:32:55.509: E/AndroidRuntime(3728): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2951)
01-22 06:32:55.509: E/AndroidRuntime(3728): at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2982)
01-22 06:32:55.509: E/AndroidRuntime(3728): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2365)
01-22 06:32:55.509: E/AndroidRuntime(3728): at android.app.ActivityThread.access$800(ActivityThread.java:144)
01-22 06:32:55.509: E/AndroidRuntime(3728): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
01-22 06:32:55.509: E/AndroidRuntime(3728): at android.os.Handler.dispatchMessage(Handler.java:102)
01-22 06:32:55.509: E/AndroidRuntime(3728): at android.os.Looper.loop(Looper.java:135)
01-22 06:32:55.509: E/AndroidRuntime(3728): at android.app.ActivityThread.main(ActivityThread.java:5221)
01-22 06:32:55.509: E/AndroidRuntime(3728): at java.lang.reflect.Method.invoke(Native Method)
01-22 06:32:55.509: E/AndroidRuntime(3728): at java.lang.reflect.Method.invoke(Method.java:372)
01-22 06:32:55.509: E/AndroidRuntime(3728): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
01-22 06:32:55.509: E/AndroidRuntime(3728): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
01-22 06:32:55.509: E/AndroidRuntime(3728): Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.ActionBar.setDisplayShowHomeEnabled(boolean)' on a null object reference
01-22 06:32:55.509: E/AndroidRuntime(3728): at com.qrme.quranmadeeasy.InnerPageActivity.ActionBar(InnerPageActivity.java:203)
01-22 06:32:55.509: E/AndroidRuntime(3728): at com.qrme.quranmadeeasy.InnerPageActivity.onResume(InnerPageActivity.java:71)
01-22 06:32:55.509: E/AndroidRuntime(3728): at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1241)
01-22 06:32:55.509: E/AndroidRuntime(3728): at android.app.Activity.performResume(Activity.java:6019)
01-22 06:32:55.509: E/AndroidRuntime(3728): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2940)
01-22 06:32:55.509: E/AndroidRuntime(3728): ... 11 more
InnerPageActivity.java:
public class InnerPageActivity extends FragmentActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.copyactivity_single_page);
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
initialize();
ActionBar(); --->71 st line
}
public void ActionBar() {
ActionBar mActionBar = getActionBar();
mActionBar.setDisplayShowHomeEnabled(false); -->203rd line
mActionBar.setDisplayShowTitleEnabled(false);
mActionBar.setBackgroundDrawable(new ColorDrawable(Color
.parseColor("#356AA0")));
mActionBar.setCustomView(mCustomView);
mActionBar.setDisplayShowCustomEnabled(true);
}
}
styles.xml:
<resources>
<style name="AppBaseTheme" parent="@style/Theme.AppCompat"></style>
<!-- Application theme. -->
<style name="AppTheme" parent="AppBaseTheme">
<!-- All customizations that are NOT specific to a particular API-level can go here. -->
</style>
</resources>
manifest.xml:
<uses-sdk
android:minSdkVersion="16"
android:targetSdkVersion="21" />
<application
android:name="com.qrme.quranmadeeasy.Application"
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name"
android:screenOrientation="portrait"
>
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
........
<application>
我不知道如何解决这个问题。任何人都可以帮我解决这个问题。谢谢。
I didn't know how to solve this.Anyone can help me with this.Thank you.
推荐答案
你应该改变
public class InnerPageActivity extends FragmentActivity
到
public class InnerPageActivity extends ActionBarActivity
并更改 mActionBar = getSupportActionBar();
这篇关于FragmentActivity上ActionBar上的空指针异常的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
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