安卓应用力,只要它打开关闭 [英] Android: Application force closing as soon as it opens
问题描述
我与Android摆弄周围Netbeans和做了一个简单的数学应用程序。某处应用突然发力,只要打开它(在模拟器上)关闭的方式......我想评论的所有code在承载主要活动类,但无济于事。因为它没有给我一个特定的错误消息,我有种丢失。
任何原因,为什么会这样?
下面是请求的布局文件:
<?XML版本=1.0编码=UTF-8&GT?;
< LinearLayout中的xmlns:机器人=http://schemas.android.com/apk/res/android
机器人:方向=垂直
机器人:layout_width =FILL_PARENT
机器人:layout_height =FILL_PARENT>
< TextView的机器人:ID =@ + ID /结果
机器人:layout_width =FILL_PARENT
机器人:layout_height =WRAP_CONTENT
机器人:文字=/>
<的LinearLayout机器人:方向=横向
机器人:layout_width =FILL_PARENT
机器人:layout_height =WRAP_CONTENT> <的TextView的android:layout_width =WRAP_CONTENT
机器人:layout_height =WRAP_CONTENT
机器人:文字=@字符串/数字/>
< EditText上机器人:ID =@ + ID / N
机器人:layout_width =WRAP_CONTENT
机器人:layout_height =WRAP_CONTENT
机器人:layout_weight =1
机器人:数字=十进制/>
<按钮机器人:ID =@ + ID /钙
机器人:文字=@字符串/计算
机器人:layout_width =WRAP_CONTENT
机器人:layout_height =WRAP_CONTENT/>
< / LinearLayout中>
< / LinearLayout中>
的建议我检查logcat的,这是错误列表
E / AndroidRuntime(881):未捕获的处理程序:螺纹主力退出,由于未捕获的异常
E / AndroidRuntime(881):了java.lang.RuntimeException:无法实例活动ComponentInfo {org.me.mathdroid / org.me.mathdroid.MainActivity}:显示java.lang.NullPointerException
E / AndroidRuntime(881):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2324)
E / AndroidRuntime(881):在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2417)
E / AndroidRuntime(881):在android.app.ActivityThread.access $ 2100(ActivityThread.java:116)
E / AndroidRuntime(881):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1794)
E / AndroidRuntime(881):在android.os.Handler.dispatchMessage(Handler.java:99)
E / AndroidRuntime(881):在android.os.Looper.loop(Looper.java:123)
E / AndroidRuntime(881):在android.app.ActivityThread.main(ActivityThread.java:4203)
E / AndroidRuntime(881):在java.lang.reflect.Method.invokeNative(NativeMethod)
E / AndroidRuntime(881):在java.lang.reflect.Method.invoke(Method.java:521)
E / AndroidRuntime(881):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:791)
E / AndroidRuntime(881):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549)
E / AndroidRuntime(881):在dalvik.system.NativeStart.main(本机方法)E / AndroidRuntime(881):显示java.lang.NullPointerException:产生的原因
E / AndroidRuntime(881):在android.app.Activity.findViewById(Activity.java:1610)
E / AndroidRuntime(881):在org.me.mathdroid.MainActivity<&初始化GT;(MainActivity.java:22)。
E / AndroidRuntime(881):在java.lang.Class.newInstanceImpl(本机方法)
E / AndroidRuntime(881):在java.lang.Class.newInstance(Class.java:1472)
E / AndroidRuntime(881):在android.app.Instrumentation.newActivity(Instrumentation.java:1097)
E / AndroidRuntime(881):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2316)
E / AndroidRuntime(881):11 ...更多
我想通了什么问题了,在主要活动我设置一个EditText和TextView的与R类的那些对象,之前设置的内容查看。很抱歉的麻烦。
I'm tinkering around with android on Netbeans and did a simple math application. Somewhere along the way the application suddenly force closes as soon as it opens(On the emulator)... I tried commenting all the code in the class that hosts the main activity but to no avail. Since it doesn't give me a specific error message, I feel kind of lost.
Any reason why this is happening?
Here is the layout file as requested:
<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView android:id="@+id/result"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text=""/>
<LinearLayout android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/number" />
<EditText android:id="@+id/n"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:numeric="decimal"/>
<Button android:id="@+id/calc"
android:text="@string/calculate"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
</LinearLayout>
As suggested I checked logcat and this is the list of errors
E/AndroidRuntime( 881): Uncaught handler: thread main exiting due to uncaught exception
E/AndroidRuntime( 881): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{org.me.mathdroid/org.me.mathdroid.MainActivity}: java.lang.NullPointerException
E/AndroidRuntime( 881): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2324)
E/AndroidRuntime( 881): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2417)
E/AndroidRuntime( 881): at android.app.ActivityThread.access$2100(ActivityThread.java:116)
E/AndroidRuntime( 881): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794)
E/AndroidRuntime( 881): at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime( 881): at android.os.Looper.loop(Looper.java:123)
E/AndroidRuntime( 881): at android.app.ActivityThread.main(ActivityThread.java:4203)
E/AndroidRuntime( 881): at java.lang.reflect.Method.invokeNative(NativeMethod)
E/AndroidRuntime( 881): at java.lang.reflect.Method.invoke(Method.java:521)
E/AndroidRuntime( 881): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
E/AndroidRuntime( 881): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549)
E/AndroidRuntime( 881): at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime( 881): Caused by: java.lang.NullPointerException
E/AndroidRuntime( 881): at android.app.Activity.findViewById(Activity.java:1610)
E/AndroidRuntime( 881): at org.me.mathdroid.MainActivity.<init>(MainActivity.java:22)
E/AndroidRuntime( 881): at java.lang.Class.newInstanceImpl(Native Method)
E/AndroidRuntime( 881): at java.lang.Class.newInstance(Class.java:1472)
E/AndroidRuntime( 881): at android.app.Instrumentation.newActivity(Instrumentation.java:1097)
E/AndroidRuntime( 881): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2316)
E/AndroidRuntime( 881): ... 11 more
I have figured out what the problem was, in the main activity I was setting an Edittext and TextView objects with the ones in the R class, before setting the contentView. Sorry for the trouble.
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