我是Android App开发的新手，我遇到了应用程序的问题。我已经阅读了有关问题的stackoverflow上可以找到的所有内容，并根据其他问题的建议检查了我的工作。
感谢您的帮助。
Unfortunately application has stopped android emulator genymotion 我试图在Samsung Gal 3选项卡上运行该应用程序。 以下是我的文件
MainActivity.java
package net.androidbootcamp.concerttickets;
import java.text.DecimalFormat;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.TextView;
public class MainActivity extends ActionBarActivity {
double costPerTicket = 79.99;
int numberOfTickets;
double totalCost;
String groupChoice;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final EditText tickets=(EditText)findViewById(R.id.txtTicket);
final Spinner group = (Spinner)findViewById(R.id.txtGroup);
Button cost = (Button)findViewById(R.id.btnCost);
cost.setOnClickListener(new OnClickListener() {
final TextView result = ((TextView)findViewById(R.id.txtResult));
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
numberOfTickets = Integer.parseInt(tickets.getText().toString());
totalCost = costPerTicket * numberOfTickets;
DecimalFormat currency = new DecimalFormat("$###,###.##");
groupChoice = group.getSelectedItem().toString();
result.setText("Total Cost for" + groupChoice + "is" + currency.format(totalCost));
}
});
}
@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);
}
}
ActivityMain.xml
<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"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="net.androidbootcamp.concerttickets.MainActivity" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:text="@string/txtTitle"
android:textSize="48sp" />
<EditText
android:id="@+id/txtTicket"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/txtGroup"
android:layout_below="@+id/textView1"
android:ems="10"
android:hint="@string/txtTickets"
android:inputType="number"
android:textSize="32sp" >
<requestFocus />
</EditText>
<Spinner
android:id="@+id/txtGroup"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/txtTicket"
android:layout_centerHorizontal="true"
android:entries="@array/txtGroup"
android:prompt="@string/prompt" />
<Button
android:id="@+id/btnCost"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/txtGroup"
android:layout_centerHorizontal="true"
android:text="@string/btnCost"
android:textSize="32sp" />
<TextView
android:id="@+id/txtResult"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/btnCost"
android:layout_centerHorizontal="true"
android:textSize="18sp" />
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/txtGroup"
android:layout_alignParentBottom="true"
android:layout_marginBottom="19dp"
android:contentDescription="@string/description"
android:src="@drawable/concert" />
</RelativeLayout>
的AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="net.androidbootcamp.concerttickets"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="21" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@android:style/Theme.Black.NoTitleBar" >
<activity
android:name="net.androidbootcamp.concerttickets.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>
LogCat
08-14 17:19:35.330: D/AndroidRuntime(20330): Shutting down VM
08-14 17:19:35.330: W/dalvikvm(20330): threadid=1: thread exiting with uncaught exception (group=0x41cf0e10)
08-14 17:19:35.340: E/AndroidRuntime(20330): FATAL EXCEPTION: main
08-14 17:19:35.340: E/AndroidRuntime(20330): java.lang.RuntimeException: Unable to start activity ComponentInfo{net.androidbootcamp.concerttickets/net.androidbootcamp.concerttickets.MainActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
08-14 17:19:35.340: E/AndroidRuntime(20330): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2245)
08-14 17:19:35.340: E/AndroidRuntime(20330): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2295)
08-14 17:19:35.340: E/AndroidRuntime(20330): at android.app.ActivityThread.access$700(ActivityThread.java:150)
08-14 17:19:35.340: E/AndroidRuntime(20330): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1280)
08-14 17:19:35.340: E/AndroidRuntime(20330): at android.os.Handler.dispatchMessage(Handler.java:99)
08-14 17:19:35.340: E/AndroidRuntime(20330): at android.os.Looper.loop(Looper.java:176)
08-14 17:19:35.340: E/AndroidRuntime(20330): at android.app.ActivityThread.main(ActivityThread.java:5279)
08-14 17:19:35.340: E/AndroidRuntime(20330): at java.lang.reflect.Method.invokeNative(Native Method)
08-14 17:19:35.340: E/AndroidRuntime(20330): at java.lang.reflect.Method.invoke(Method.java:511)
08-14 17:19:35.340: E/AndroidRuntime(20330): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
08-14 17:19:35.340: E/AndroidRuntime(20330): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
08-14 17:19:35.340: E/AndroidRuntime(20330): at dalvik.system.NativeStart.main(Native Method)
08-14 17:19:35.340: E/AndroidRuntime(20330): Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
08-14 17:19:35.340: E/AndroidRuntime(20330): at android.support.v7.app.ActionBarActivityDelegate.onCreate(ActionBarActivityDelegate.java:110)
08-14 17:19:35.340: E/AndroidRuntime(20330): at android.support.v7.app.ActionBarActivityDelegateICS.onCreate(ActionBarActivityDelegateICS.java:57)
08-14 17:19:35.340: E/AndroidRuntime(20330): at android.support.v7.app.ActionBarActivity.onCreate(ActionBarActivity.java:99)
08-14 17:19:35.340: E/AndroidRuntime(20330): at net.androidbootcamp.concerttickets.MainActivity.onCreate(MainActivity.java:26)
08-14 17:19:35.340: E/AndroidRuntime(20330): at android.app.Activity.performCreate(Activity.java:5267)
08-14 17:19:35.340: E/AndroidRuntime(20330): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1097)
08-14 17:19:35.340: E/AndroidRuntime(20330): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2209)
08-14 17:19:35.340: E/AndroidRuntime(20330): ... 11 more
答案 0 :(得分：0)
LogCat输出显示您没有正确使用主题。特别是，它希望您使用兼容性主题。您可以通过更改/包含清单文件中活动的theme属性来实现此目的。
如果您实际上不打算使用操作栏，那么您也可以将活动的父级从ActionbarActivity更改为仅Activity，如下所示：
public class MainActivity extends Activity {