我还在学习Android应用程序的开发,在我开始使用谷歌地图api v2(尚未使用它)制作一个非常简单的应用程序时,我在我的索尼Xperia SL上运行它说“不幸myapp停止”。 LogCat中的红色信息是“无法打开文件进行阅读”(两次)。
MainMenu.java
public class MainMenu extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_menu);
Button bntStart = (Button) findViewById(R.id.buttonStart);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(1, menu);
return true;
}
}
MainActivity.java
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
activity_main_menu.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/menu_bg"
android:gravity="center_vertical"
android:orientation="vertical" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center" >
<Button
android:id="@+id/buttonStart"
android:layout_width="80dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_margin="5dp"
android:text="Start" />
<Button
android:id="@+id/buttonStop"
android:layout_width="80dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_margin="5dp"
android:text="Stop" />
</LinearLayout>
<Button
android:id="@+id/buttonExit"
android:layout_width="80dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_margin="5dp"
android:text="Exit" />
</LinearLayout>
activity_main.xml中
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<fragment
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.MapFragment" />
</RelativeLayout>
清单
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="taxi.route"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="11"
android:targetSdkVersion="16" />
<permission
android:name="taxi.route.permission.MAPS_RECEIVE"
android:protectionLevel="signature" />
<uses-permission android:name="taxi.route.permission.MAPS_RECEIVE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-feature
android:glEsVersion="0x00020000"
android:required="true" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="taxi.route.MainMenu"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="AIzaSyCwPOMQ3LaE81JN3wdY6DvUi7EIJdn0q-I" />
<activity
android:name="taxi.route.MainActivity"
android:label="activity_main" >
</activity>
</application>
</manifest>
堆栈跟踪(我不确定这是不是很简单)
01-20 17:48:32.129: D/dalvikvm(663): Late-enabling CheckJNI
01-20 17:48:32.399: D/TextLayoutCache(663): Using debug level: 0 - Debug Enabled: 0
01-20 17:48:32.459: D/libEGL(663): loaded /system/lib/egl/libGLES_android.so
01-20 17:48:32.469: D/libEGL(663): loaded /system/lib/egl/libEGL_adreno200.so
01-20 17:48:32.469: D/libEGL(663): loaded /system/lib/egl/libGLESv1_CM_adreno200.so
01-20 17:48:32.469: D/libEGL(663): loaded /system/lib/egl/libGLESv2_adreno200.so
01-20 17:48:32.509: I/Adreno200-EGLSUB(663): <ConfigWindowMatch:2078>: Format RGBA_8888.
01-20 17:48:32.519: D/memalloc(663): /dev/pmem: Mapped buffer base:0x5c67c000 size:27111424 offset:23343104 fd:64
01-20 17:48:32.519: E/(663): Can't open file for reading
01-20 17:48:32.519: E/(663): Can't open file for reading
01-20 17:48:32.529: D/OpenGLRenderer(663): Enabling debug mode 0
01-20 17:48:32.529: W/ResourceType(663): No package identifier when getting value for resource number 0x00000001
01-20 17:48:32.529: D/AndroidRuntime(663): Shutting down VM
01-20 17:48:32.529: W/dalvikvm(663): threadid=1: thread exiting with uncaught exception (group=0x40aa8210)
01-20 17:48:32.529: E/AndroidRuntime(663): FATAL EXCEPTION: main
01-20 17:48:32.529: E/AndroidRuntime(663): android.content.res.Resources$NotFoundException: Resource ID #0x1
01-20 17:48:32.529: E/AndroidRuntime(663): at android.content.res.Resources.getValue(Resources.java:1023)
01-20 17:48:32.529: E/AndroidRuntime(663): at android.content.res.Resources.loadXmlResourceParser(Resources.java:2110)
01-20 17:48:32.529: E/AndroidRuntime(663): at android.content.res.Resources.getLayout(Resources.java:862)
01-20 17:48:32.529: E/AndroidRuntime(663): at android.view.MenuInflater.inflate(MenuInflater.java:92)
01-20 17:48:32.529: E/AndroidRuntime(663): at taxi.route.MainMenu.onCreateOptionsMenu(MainMenu.java:21)
01-20 17:48:32.529: E/AndroidRuntime(663): at android.app.Activity.onCreatePanelMenu(Activity.java:2444)
01-20 17:48:32.529: E/AndroidRuntime(663): at com.android.internal.policy.impl.PhoneWindow.preparePanel(PhoneWindow.java:392)
01-20 17:48:32.529: E/AndroidRuntime(663): at com.android.internal.policy.impl.PhoneWindow.invalidatePanelMenu(PhoneWindow.java:743)
01-20 17:48:32.529: E/AndroidRuntime(663): at com.android.internal.policy.impl.PhoneWindow$1.run(PhoneWindow.java:2838)
01-20 17:48:32.529: E/AndroidRuntime(663): at android.os.Handler.handleCallback(Handler.java:605)
01-20 17:48:32.529: E/AndroidRuntime(663): at android.os.Handler.dispatchMessage(Handler.java:92)
01-20 17:48:32.529: E/AndroidRuntime(663): at android.os.Looper.loop(Looper.java:137)
01-20 17:48:32.529: E/AndroidRuntime(663): at android.app.ActivityThread.main(ActivityThread.java:4441)
01-20 17:48:32.529: E/AndroidRuntime(663): at java.lang.reflect.Method.invokeNative(Native Method)
01-20 17:48:32.529: E/AndroidRuntime(663): at java.lang.reflect.Method.invoke(Method.java:511)
01-20 17:48:32.529: E/AndroidRuntime(663): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:823)
01-20 17:48:32.529: E/AndroidRuntime(663): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590)
01-20 17:48:32.529: E/AndroidRuntime(663): at dalvik.system.NativeStart.main(Native Method)
01-20 17:48:35.009: I/Process(663): Sending signal. PID: 663 SIG: 9
答案 0 :(得分:0)
由于MainMenu
中的这一行
getMenuInflater().inflate(1, menu);
inflate()
期望指向XML菜单文件的资源ID和Menu
对象。但是,1
几乎肯定不是有效的ID,导致异常。尝试将ID传递给Menu XML文件。
答案 1 :(得分:-1)
习惯使用异常处理,以便您没有崩溃的应用程序。至少做一些事情:
try {
/// my code
} catch (Trowable t) {
Log.e("MyTag", t.getMessage(), t);
}
大多数时候你想做更多的事情:
try {
/// my code
} catch (MostLikelyException mle) {
/// Handle the exception
} catch (LikelyException le) {
/// Handle the exception
} catch (Trowable t) {
/// Handle the exception
}
由于您无法访问日志,因此解决方法是使用toast来获取异常信息。
在try / catch中包装每个方法的代码。捕获异常时,使用Toast.makeText处理它(此/ 指向活动的指针 /,t.getMessage,Toast.LENGTH_LONG).show();
找出无法访问日志的原因应该是一个高优先级。