我是一名初学者，正在学习 Android 编程。我正在按照 Android Developers 的指南开始学习 Android。
当我尝试在模拟器上运行简单的“Hello World”应用程序时，模拟器显示“很遗憾，我的第一个应用程序已停止运行。”其中“我的第一个应用程序”是应用程序的名称。
这是我的 AndroidManifest 文件：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.myfirstapp"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="19" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.myfirstapp.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
这是我的主活动文件：
package com.example.myfirstapp;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.os.Build;
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment())
.commit();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
return rootView;
}
}
}
这是LogCat:
06-13 23:56:44.148: I/Process(1209): Sending signal. PID: 1209 SIG: 9
06-13 23:56:45.828: W/dalvikvm(1249): VFY: unable to resolve static field 1559 (ActionBarWindow) in Landroid/support/v7/appcompat/R$styleable;
06-13 23:56:45.828: D/dalvikvm(1249): VFY: replacing opcode 0x62 at 0x0004
06-13 23:56:45.848: D/AndroidRuntime(1249): Shutting down VM
06-13 23:56:45.848: W/dalvikvm(1249): threadid=1: thread exiting with uncaught exception (group=0xb2a6fba8)
06-13 23:56:45.878: E/AndroidRuntime(1249): FATAL EXCEPTION: main
06-13 23:56:45.878: E/AndroidRuntime(1249): Process: com.example.myfirstapp, PID: 1249
06-13 23:56:45.878: E/AndroidRuntime(1249): java.lang.NoClassDefFoundError: android.support.v7.appcompat.R$styleable
06-13 23:56:45.878: E/AndroidRuntime(1249): at android.support.v7.app.ActionBarActivityDelegate.onCreate(ActionBarActivityDelegate.java:107)
06-13 23:56:45.878: E/AndroidRuntime(1249): at android.support.v7.app.ActionBarActivityDelegateICS.onCreate(ActionBarActivityDelegateICS.java:58)
06-13 23:56:45.878: E/AndroidRuntime(1249): at android.support.v7.app.ActionBarActivity.onCreate(ActionBarActivity.java:98)
06-13 23:56:45.878: E/AndroidRuntime(1249): at com.example.myfirstapp.MainActivity.onCreate(MainActivity.java:18)
06-13 23:56:45.878: E/AndroidRuntime(1249): at android.app.Activity.performCreate(Activity.java:5231)
06-13 23:56:45.878: E/AndroidRuntime(1249): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
06-13 23:56:45.878: E/AndroidRuntime(1249): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
06-13 23:56:45.878: E/AndroidRuntime(1249): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
06-13 23:56:45.878: E/AndroidRuntime(1249): at android.app.ActivityThread.access$800(ActivityThread.java:135)
06-13 23:56:45.878: E/AndroidRuntime(1249): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
06-13 23:56:45.878: E/AndroidRuntime(1249): at android.os.Handler.dispatchMessage(Handler.java:102)
06-13 23:56:45.878: E/AndroidRuntime(1249): at android.os.Looper.loop(Looper.java:136)
06-13 23:56:45.878: E/AndroidRuntime(1249): at android.app.ActivityThread.main(ActivityThread.java:5017)
06-13 23:56:45.878: E/AndroidRuntime(1249): at java.lang.reflect.Method.invokeNative(Native Method)
06-13 23:56:45.878: E/AndroidRuntime(1249): at java.lang.reflect.Method.invoke(Method.java:515)
06-13 23:56:45.878: E/AndroidRuntime(1249): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
06-13 23:56:45.878: E/AndroidRuntime(1249): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
06-13 23:56:45.878: E/AndroidRuntime(1249): at dalvik.system.NativeStart.main(Native Method)
06-13 23:56:53.678: I/Process(1249): Sending signal. PID: 1249 SIG: 9
这是activity_main文件：
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.myfirstapp.MainActivity"
tools:ignore="MergeRootFrame" />
activity_main的布局。 - Xaver KapellerActivity中使用的布局。在onCreate()方法中：setContentView(R.layout.activity_main);- Xaver Kapeller