Java ActionBar上出现空指针异常
我在运行时遇到这个错误 java.lang.RuntimeException:无法启动活动组件信息 必须调用android.util.AndroidRuntimeException:requestFeature() 在添加内容之前 StackTrace:Java ActionBar上出现空指针异常,java,android,nullpointerexception,stack-trace,android-logcat,Java,Android,Nullpointerexception,Stack Trace,Android Logcat,我在运行时遇到这个错误 java.lang.RuntimeException:无法启动活动组件信息 必须调用android.util.AndroidRuntimeException:requestFeature() 在添加内容之前 StackTrace: 01-22 04:55:59.728: E/AndroidRuntime(2443): FATAL EXCEPTION: main 01-22 04:55:59.728: E/AndroidRuntime(2443): Process: com
01-22 04:55:59.728: E/AndroidRuntime(2443): FATAL EXCEPTION: main
01-22 04:55:59.728: E/AndroidRuntime(2443): Process: com.qrme.quranmadeeasy, PID: 2443
01-22 04:55:59.728: E/AndroidRuntime(2443): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.qrme.quranmadeeasy/com.qrme.quranmadeeasy.ChapterActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.ActionBar.setBackgroundDrawable(android.graphics.drawable.Drawable)' on a null object reference
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.app.ActivityThread.access$800(ActivityThread.java:144)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.os.Handler.dispatchMessage(Handler.java:102)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.os.Looper.loop(Looper.java:135)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.app.ActivityThread.main(ActivityThread.java:5221)
01-22 04:55:59.728: E/AndroidRuntime(2443): at java.lang.reflect.Method.invoke(Native Method)
01-22 04:55:59.728: E/AndroidRuntime(2443): at java.lang.reflect.Method.invoke(Method.java:372)
01-22 04:55:59.728: E/AndroidRuntime(2443): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
01-22 04:55:59.728: E/AndroidRuntime(2443): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
01-22 04:55:59.728: E/AndroidRuntime(2443): Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.ActionBar.setBackgroundDrawable(android.graphics.drawable.Drawable)' on a null object reference
01-22 04:55:59.728: E/AndroidRuntime(2443): at com.qrme.quranmadeeasy.ChapterActivity.ActionBar(ChapterActivity.java:212)
01-22 04:55:59.728: E/AndroidRuntime(2443): at com.qrme.quranmadeeasy.ChapterActivity.initialize(ChapterActivity.java:112)
01-22 04:55:59.728: E/AndroidRuntime(2443): at com.qrme.quranmadeeasy.ChapterActivity.onCreate(ChapterActivity.java:68)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.app.Activity.performCreate(Activity.java:5933)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
01-22 04:55:59.728: E/AndroidRuntime(2443): ... 10 more
import android.support.v7.app.ActionBarActivity;
public class ChapterActivity extends ActionBarActivity implements OnItemClickListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// requestWindowFeature(Window.FEATURE_ACTION_BAR);
setContentView(R.layout.activity_chapter);
initialize(); --->68th line
}
private void initialize() {
listChapter.setDivider(new ColorDrawable(Color
.parseColor(separator_grey)));
listChapter.setDividerHeight(2);
............
ActionBar(); -->112th line
}
public void ActionBar() {
ActionBar actionBar = getActionBar();
actionBar.setBackgroundDrawable(new ColorDrawable(Color --->212th line
.parseColor(white)));
actionBar.setDisplayShowHomeEnabled(false);
actionBar.setDisplayShowTitleEnabled(false);
LayoutInflater mInflater = LayoutInflater.from(this);
.........
actionBar.setCustomView(mCustomView);
actionBar.setDisplayShowCustomEnabled(true);
}
}
<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>
编辑:
01-22 04:55:59.728: E/AndroidRuntime(2443): FATAL EXCEPTION: main
01-22 04:55:59.728: E/AndroidRuntime(2443): Process: com.qrme.quranmadeeasy, PID: 2443
01-22 04:55:59.728: E/AndroidRuntime(2443): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.qrme.quranmadeeasy/com.qrme.quranmadeeasy.ChapterActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.ActionBar.setBackgroundDrawable(android.graphics.drawable.Drawable)' on a null object reference
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.app.ActivityThread.access$800(ActivityThread.java:144)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.os.Handler.dispatchMessage(Handler.java:102)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.os.Looper.loop(Looper.java:135)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.app.ActivityThread.main(ActivityThread.java:5221)
01-22 04:55:59.728: E/AndroidRuntime(2443): at java.lang.reflect.Method.invoke(Native Method)
01-22 04:55:59.728: E/AndroidRuntime(2443): at java.lang.reflect.Method.invoke(Method.java:372)
01-22 04:55:59.728: E/AndroidRuntime(2443): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
01-22 04:55:59.728: E/AndroidRuntime(2443): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
01-22 04:55:59.728: E/AndroidRuntime(2443): Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.ActionBar.setBackgroundDrawable(android.graphics.drawable.Drawable)' on a null object reference
01-22 04:55:59.728: E/AndroidRuntime(2443): at com.qrme.quranmadeeasy.ChapterActivity.ActionBar(ChapterActivity.java:212)
01-22 04:55:59.728: E/AndroidRuntime(2443): at com.qrme.quranmadeeasy.ChapterActivity.initialize(ChapterActivity.java:112)
01-22 04:55:59.728: E/AndroidRuntime(2443): at com.qrme.quranmadeeasy.ChapterActivity.onCreate(ChapterActivity.java:68)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.app.Activity.performCreate(Activity.java:5933)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
01-22 04:55:59.728: E/AndroidRuntime(2443): ... 10 more
import android.support.v7.app.ActionBarActivity;
public class ChapterActivity extends ActionBarActivity implements OnItemClickListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// requestWindowFeature(Window.FEATURE_ACTION_BAR);
setContentView(R.layout.activity_chapter);
initialize(); --->68th line
}
private void initialize() {
listChapter.setDivider(new ColorDrawable(Color
.parseColor(separator_grey)));
listChapter.setDividerHeight(2);
............
ActionBar(); -->112th line
}
public void ActionBar() {
ActionBar actionBar = getActionBar();
actionBar.setBackgroundDrawable(new ColorDrawable(Color --->212th line
.parseColor(white)));
actionBar.setDisplayShowHomeEnabled(false);
actionBar.setDisplayShowTitleEnabled(false);
LayoutInflater mInflater = LayoutInflater.from(this);
.........
actionBar.setCustomView(mCustomView);
actionBar.setDisplayShowCustomEnabled(true);
}
}
<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>
ChapterActivity.java:
01-22 04:55:59.728: E/AndroidRuntime(2443): FATAL EXCEPTION: main
01-22 04:55:59.728: E/AndroidRuntime(2443): Process: com.qrme.quranmadeeasy, PID: 2443
01-22 04:55:59.728: E/AndroidRuntime(2443): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.qrme.quranmadeeasy/com.qrme.quranmadeeasy.ChapterActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.ActionBar.setBackgroundDrawable(android.graphics.drawable.Drawable)' on a null object reference
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.app.ActivityThread.access$800(ActivityThread.java:144)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.os.Handler.dispatchMessage(Handler.java:102)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.os.Looper.loop(Looper.java:135)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.app.ActivityThread.main(ActivityThread.java:5221)
01-22 04:55:59.728: E/AndroidRuntime(2443): at java.lang.reflect.Method.invoke(Native Method)
01-22 04:55:59.728: E/AndroidRuntime(2443): at java.lang.reflect.Method.invoke(Method.java:372)
01-22 04:55:59.728: E/AndroidRuntime(2443): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
01-22 04:55:59.728: E/AndroidRuntime(2443): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
01-22 04:55:59.728: E/AndroidRuntime(2443): Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.ActionBar.setBackgroundDrawable(android.graphics.drawable.Drawable)' on a null object reference
01-22 04:55:59.728: E/AndroidRuntime(2443): at com.qrme.quranmadeeasy.ChapterActivity.ActionBar(ChapterActivity.java:212)
01-22 04:55:59.728: E/AndroidRuntime(2443): at com.qrme.quranmadeeasy.ChapterActivity.initialize(ChapterActivity.java:112)
01-22 04:55:59.728: E/AndroidRuntime(2443): at com.qrme.quranmadeeasy.ChapterActivity.onCreate(ChapterActivity.java:68)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.app.Activity.performCreate(Activity.java:5933)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
01-22 04:55:59.728: E/AndroidRuntime(2443): ... 10 more
import android.support.v7.app.ActionBarActivity;
public class ChapterActivity extends ActionBarActivity implements OnItemClickListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// requestWindowFeature(Window.FEATURE_ACTION_BAR);
setContentView(R.layout.activity_chapter);
initialize(); --->68th line
}
private void initialize() {
listChapter.setDivider(new ColorDrawable(Color
.parseColor(separator_grey)));
listChapter.setDividerHeight(2);
............
ActionBar(); -->112th line
}
public void ActionBar() {
ActionBar actionBar = getActionBar();
actionBar.setBackgroundDrawable(new ColorDrawable(Color --->212th line
.parseColor(white)));
actionBar.setDisplayShowHomeEnabled(false);
actionBar.setDisplayShowTitleEnabled(false);
LayoutInflater mInflater = LayoutInflater.from(this);
.........
actionBar.setCustomView(mCustomView);
actionBar.setDisplayShowCustomEnabled(true);
}
}
<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>
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>
清单:
01-22 04:55:59.728: E/AndroidRuntime(2443): FATAL EXCEPTION: main
01-22 04:55:59.728: E/AndroidRuntime(2443): Process: com.qrme.quranmadeeasy, PID: 2443
01-22 04:55:59.728: E/AndroidRuntime(2443): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.qrme.quranmadeeasy/com.qrme.quranmadeeasy.ChapterActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.ActionBar.setBackgroundDrawable(android.graphics.drawable.Drawable)' on a null object reference
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.app.ActivityThread.access$800(ActivityThread.java:144)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.os.Handler.dispatchMessage(Handler.java:102)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.os.Looper.loop(Looper.java:135)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.app.ActivityThread.main(ActivityThread.java:5221)
01-22 04:55:59.728: E/AndroidRuntime(2443): at java.lang.reflect.Method.invoke(Native Method)
01-22 04:55:59.728: E/AndroidRuntime(2443): at java.lang.reflect.Method.invoke(Method.java:372)
01-22 04:55:59.728: E/AndroidRuntime(2443): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
01-22 04:55:59.728: E/AndroidRuntime(2443): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
01-22 04:55:59.728: E/AndroidRuntime(2443): Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.ActionBar.setBackgroundDrawable(android.graphics.drawable.Drawable)' on a null object reference
01-22 04:55:59.728: E/AndroidRuntime(2443): at com.qrme.quranmadeeasy.ChapterActivity.ActionBar(ChapterActivity.java:212)
01-22 04:55:59.728: E/AndroidRuntime(2443): at com.qrme.quranmadeeasy.ChapterActivity.initialize(ChapterActivity.java:112)
01-22 04:55:59.728: E/AndroidRuntime(2443): at com.qrme.quranmadeeasy.ChapterActivity.onCreate(ChapterActivity.java:68)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.app.Activity.performCreate(Activity.java:5933)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
01-22 04:55:59.728: E/AndroidRuntime(2443): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
01-22 04:55:59.728: E/AndroidRuntime(2443): ... 10 more
import android.support.v7.app.ActionBarActivity;
public class ChapterActivity extends ActionBarActivity implements OnItemClickListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// requestWindowFeature(Window.FEATURE_ACTION_BAR);
setContentView(R.layout.activity_chapter);
initialize(); --->68th line
}
private void initialize() {
listChapter.setDivider(new ColorDrawable(Color
.parseColor(separator_grey)));
listChapter.setDividerHeight(2);
............
ActionBar(); -->112th line
}
public void ActionBar() {
ActionBar actionBar = getActionBar();
actionBar.setBackgroundDrawable(new ColorDrawable(Color --->212th line
.parseColor(white)));
actionBar.setDisplayShowHomeEnabled(false);
actionBar.setDisplayShowTitleEnabled(false);
LayoutInflater mInflater = LayoutInflater.from(this);
.........
actionBar.setCustomView(mCustomView);
actionBar.setDisplayShowCustomEnabled(true);
}
}
<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。谢谢。删除线路
requestWindowFeature(Window.FEATURE_ACTION_BAR);
使用Theme.AppCompat
(它添加了自己的操作栏)时,不需要它。还要确保您的活动扩展了ActionBarActivity
(根据Theme.AppCompat
的要求),而不是activity
使用ActionBarActivity
时,还必须使用而不是getActionBar()
第212行
错误:可着色(Color.parseColor(白色))代码>
正确:可着色(Color.parseColor(“#FFFFFF”)代码>我改变了这一点。现在也得到了与您使用的getActionBar()
相同的日志,您需要使用getSupportActionBar()
android.support.v7.app.ActionBar ActionBar=getSupportActionBar()代码>我这样更改了那一行。解决了我的问题。非常感谢。将在2分钟内接受您的答案。您希望支持的最小API是什么?