启动新活动时应用程序崩溃
启动新活动时应用程序崩溃
提问于 2015-11-10 13:40:31
我创建了一个活动来测试一些叫做Parse的东西。我试过5次开始它的活动。我用不同的名称重新创建了这个活动，重写了意图内容，并更改了运行代码的按钮。所有的尝试都失败了。
这是我的密码：
Intent intent = new Intent(Login.this,Parse.class);
startActivity(intent);我得到以下LogCat：
11-10 10:26:27.211 17518-17518/? I/art: Late-enabling -Xcheck:jni
11-10 10:26:27.427 17518-17556/rafaelmarinho.dobau D/OpenGLRenderer: Use EGL_SWAP_BEHAVIOR_PRESERVED: true
11-10 10:26:27.441 17518-17518/rafaelmarinho.dobau D/Atlas: Validating map...
11-10 10:26:27.543 17518-17518/rafaelmarinho.dobau D/AndroidRuntime: Shutting down VM
11-10 10:26:27.545 17518-17518/rafaelmarinho.dobau E/AndroidRuntime: FATAL EXCEPTION: main
11-10 10:26:27.545 17518-17518/rafaelmarinho.dobau E/AndroidRuntime: Process: rafaelmarinho.dobau, PID: 17518
11-10 10:26:27.545 17518-17518/rafaelmarinho.dobau E/AndroidRuntime: java.lang.RuntimeException: Unable to start activity ComponentInfo{rafaelmarinho.dobau/rafaelmarinho.dobau.Parse}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.app.ActionBar.setDisplayHomeAsUpEnabled(boolean)' on a null object reference
11-10 10:26:27.545 17518-17518/rafaelmarinho.dobau E/AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2339)
11-10 10:26:27.545 17518-17518/rafaelmarinho.dobau E/AndroidRuntime: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2413)
11-10 10:26:27.545 17518-17518/rafaelmarinho.dobau E/AndroidRuntime: at android.app.ActivityThread.access$800(ActivityThread.java:155)
11-10 10:26:27.545 17518-17518/rafaelmarinho.dobau E/AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1317)
11-10 10:26:27.545 17518-17518/rafaelmarinho.dobau E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:102)
11-10 10:26:27.545 17518-17518/rafaelmarinho.dobau E/AndroidRuntime: at android.os.Looper.loop(Looper.java:135)
11-10 10:26:27.545 17518-17518/rafaelmarinho.dobau E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:5343)
11-10 10:26:27.545 17518-17518/rafaelmarinho.dobau E/AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)
11-10 10:26:27.545 17518-17518/rafaelmarinho.dobau E/AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:372)
11-10 10:26:27.545 17518-17518/rafaelmarinho.dobau E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905)
11-10 10:26:27.545 17518-17518/rafaelmarinho.dobau E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:700)
11-10 10:26:27.545 17518-17518/rafaelmarinho.dobau E/AndroidRuntime: Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.app.ActionBar.setDisplayHomeAsUpEnabled(boolean)' on a null object reference
11-10 10:26:27.545 17518-17518/rafaelmarinho.dobau E/AndroidRuntime: at rafaelmarinho.dobau.Parse.onCreate(Parse.java:12)
11-10 10:26:27.545 17518-17518/rafaelmarinho.dobau E/AndroidRuntime: at android.app.Activity.performCreate(Activity.java:6010)
11-10 10:26:27.545 17518-17518/rafaelmarinho.dobau E/AndroidRuntime: at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1129)
11-10 10:26:27.545 17518-17518/rafaelmarinho.dobau E/AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2292)
11-10 10:26:27.545 17518-17518/rafaelmarinho.dobau E/AndroidRuntime: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2413)
11-10 10:26:27.545 17518-17518/rafaelmarinho.dobau E/AndroidRuntime: at android.app.ActivityThread.access$800(ActivityThread.java:155)
11-10 10:26:27.545 17518-17518/rafaelmarinho.dobau E/AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1317)
11-10 10:26:27.545 17518-17518/rafaelmarinho.dobau E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:102)
11-10 10:26:27.545 17518-17518/rafaelmarinho.dobau E/AndroidRuntime: at android.os.Looper.loop(Looper.java:135)
11-10 10:26:27.545 17518-17518/rafaelmarinho.dobau E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:5343)
11-10 10:26:27.545 17518-17518/rafaelmarinho.dobau E/AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)
11-10 10:26:27.545 17518-17518/rafaelmarinho.dobau E/AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:372)
11-10 10:26:27.545 17518-17518/rafaelmarinho.dobau E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905)
11-10 10:26:27.545 17518-17518/rafaelmarinho.dobau E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:700)
11-10 10:26:29.382 17518-17518/rafaelmarinho.dobau I/Process: Sending signal. PID: 17518 SIG: 9那么我能做些什么来解决这个问题呢？
回答 1
Stack Overflow用户
回答已采纳
发布于 2015-11-10 13:52:02
每当您试图禁用home按钮或在Actionbar上执行任何操作时，您都应该检查getSupportActionbar是否为null，因为这取决于应用程序主题。
if(getSupportActionBar()!=null){
setDisplayShowTitleEnabled(false);
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/33631376
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