如何在我的应用程序中纠正强制关闭错误
问题描述:
我可以在我的应用程序中找到错误。当我试图执行我的应用程序强制关闭错误出现。如何在我的应用程序中纠正强制关闭错误
public class Main extends Activity {
Button btnAdd;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btnAdd = (Button) findViewById(R.id.btnAdd);
btnAdd.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent listIntent = new Intent (v.getContext(),Newbook.class) ;
startActivity(listIntent);
}
});
}
}
和日志猫错误是
03-31 16:05:57.493: D/AndroidRuntime(387): Shutting down VM
03-31 16:05:57.493: W/dalvikvm(387): threadid=3: thread exiting with uncaught exception (group=0x4001b188)
03-31 16:05:57.503: E/AndroidRuntime(387): Uncaught handler: thread main exiting due to uncaught exception
03-31 16:05:57.597: E/AndroidRuntime(387): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.sam.daybook/com.sam.daybook.DayBookActivity}: java.lang.ClassNotFoundException: com.sam.daybook.DayBookActivity in loader [email protected]
03-31 16:05:57.597: E/AndroidRuntime(387): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2417)
03-31 16:05:57.597: E/AndroidRuntime(387): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512)
03-31 16:05:57.597: E/AndroidRuntime(387): at android.app.ActivityThread.access$2200(ActivityThread.java:119)
03-31 16:05:57.597: E/AndroidRuntime(387): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
03-31 16:05:57.597: E/AndroidRuntime(387): at android.os.Handler.dispatchMessage(Handler.java:99)
03-31 16:05:57.597: E/AndroidRuntime(387): at android.os.Looper.loop(Looper.java:123)
03-31 16:05:57.597: E/AndroidRuntime(387): at android.app.ActivityThread.main(ActivityThread.java:4363)
03-31 16:05:57.597: E/AndroidRuntime(387): at java.lang.reflect.Method.invokeNative(Native Method)
03-31 16:05:57.597: E/AndroidRuntime(387): at java.lang.reflect.Method.invoke(Method.java:521)
03-31 16:05:57.597: E/AndroidRuntime(387): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
03-31 16:05:57.597: E/AndroidRuntime(387): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
03-31 16:05:57.597: E/AndroidRuntime(387): at dalvik.system.NativeStart.main(Native Method)
03-31 16:05:57.597: E/AndroidRuntime(387): Caused by: java.lang.ClassNotFoundException: com.sam.daybook.DayBookActivity in loader [email protected]
03-31 16:05:57.597: E/AndroidRuntime(387): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243)
03-31 16:05:57.597: E/AndroidRuntime(387): at java.lang.ClassLoader.loadClass(ClassLoader.java:573)
03-31 16:05:57.597: E/AndroidRuntime(387): at java.lang.ClassLoader.loadClass(ClassLoader.java:532)
03-31 16:05:57.597: E/AndroidRuntime(387): at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
03-31 16:05:57.597: E/AndroidRuntime(387): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2409)
03-31 16:05:57.597: E/AndroidRuntime(387): ... 11 more
03-31 16:05:57.684: I/dalvikvm(387): threadid=7: reacting to signal 3
03-31 16:05:57.863: I/dalvikvm(387): Wrote stack trace to '/data/anr/traces.txt'
答
尝试添加以下行到我们的项目的Android清单
<activity android:name="NAME_OF_YOUR_CLASS">
<intent-filter>
<action android:name="NAME_OF_YOUR_INTENT"/>
<category android:name="android.intent.category.DEFAULT"/>
</intent-filter>
</activity>
使用以下行然后开始你的活动
startActivity(new Intent("NAME_OF_YOUR_INTENT"));
确保你的意图的名字上面的行和清单中的内容完全相同。
答
在这种缺乏错误的,你可以找到错误,崩溃的应用程序通过你的包名称,如:
com.sam.daybook
和类或活动,如:
com.sam.daybook.DayBookActivity
和右的错误是:
java.lang.ClassNotFoundException: com.sam.daybook.DayBookActivity in loader [email protected] 03-31 16:05:57.597:
我希望这可能有助于你...
答
它看起来像Android一样找不到自己的活动类: 这是告诉您活动无法从您的代码实例化。
Unable to instantiate activity ComponentInfo{com.sam.daybook/com.sam.daybook.DayBookActivity}:
然后这是告诉你,无法找到类com.sam.daybook.DayBookActivity
。
java.lang.ClassNotFoundException: com.sam.daybook.DayBookActivity in loader
请问类DayBookActivity
的src/com/sam/daybook/
内部存在?
您发布的代码是针对名为Main
的课程,如果这是您期望加载的活动,我认为您可能需要将课程重命名为DayBookActivity
。您还需要将Main.java
文件重命名为DayBookActivity.java
。
答
试试这个 意图listIntent = new Intent(Main.this,Newbook.class);
在您的清单中声明了'Newbook'活动。 – dreamtale 2012-03-31 10:49:49
使用'getBaseContext()'作为上下文,所以你的行应该是'Intent listIntent = new Intent(getBaseContext(),Newbook.class);' – 2012-03-31 10:52:39
我认为你已经在清单中声明了一个名为DayBookActivity的活动,您的src代码,您没有具有该名称的活动, – Houcine 2012-03-31 10:54:15