我应该为课程制作一个应用程序，在案例人数和帐单成本的情况下从用户那里获取输入，然后告诉你每个人添加了提示的成本是多少。事情是看起来它应该工作，但我是新的，所以不确定，但每次我在eclipse中运行模拟器它一直说我的应用程序已停止工作，请帮助。 这是我的代码。 第一次主动活动。
package com.example.splitbill;
import android.support.v7.app.ActionBarActivity;
import android.content.Intent;
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;
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button b = (Button) findViewById(R.id.btnCalc);
b.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
startActivity(new Intent(MainActivity.this, Calc.class));
}
});
}
@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);
}
}
然后我的第二个活动叫做Calc
package com.example.splitbill;
import java.text.DecimalFormat;
import android.app.Activity;
import android.os.Bundle;
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 Calc extends Activity {
double totalOfBill;
int numberOfGuests;
double perPersonSplit;
String groupChoice;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.calc);
final EditText guests=(EditText)findViewById(R.id.txtGuests);
final EditText bill=(EditText)findViewById(R.id.txtBill);
final Spinner group = (Spinner)findViewById(R.id.txtGroup);
Button cost = (Button)findViewById(R.id.btnSplit);
cost.setOnClickListener(new OnClickListener() {
final TextView result = ((TextView)findViewById(R.id.txtResult));
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
totalOfBill = Double.parseDouble(bill.getText().toString());
numberOfGuests = Integer.parseInt(guests.getText().toString());
perPersonSplit = (totalOfBill * .18 +totalOfBill) / numberOfGuests;
DecimalFormat currency = new DecimalFormat("$###,###.##");
groupChoice = group.getSelectedItem().toString();
result.setText("Quality is " + groupChoice + "cost is " + currency.format(perPersonSplit));
}
});
}
}
如果有人能提供帮助那就太棒了。有人问我这里的错误日志，我想是
02-03 16:53:14.297: D/AndroidRuntime(1043): Shutting down VM
02-03 16:53:14.297: D/AndroidRuntime(1043): --------- beginning of crash
02-03 16:53:14.312: E/AndroidRuntime(1043): FATAL EXCEPTION: main
02-03 16:53:14.312: E/AndroidRuntime(1043): Process: com.example.splitbill, PID: 1043
02-03 16:53:14.312: E/AndroidRuntime(1043): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.splitbill/com.example.splitbill.MainActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
02-03 16:53:14.312: E/AndroidRuntime(1043): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
02-03 16:53:14.312: E/AndroidRuntime(1043): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
02-03 16:53:14.312: E/AndroidRuntime(1043): at android.app.ActivityThread.access$800(ActivityThread.java:144)
02-03 16:53:14.312: E/AndroidRuntime(1043): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
02-03 16:53:14.312: E/AndroidRuntime(1043): at android.os.Handler.dispatchMessage(Handler.java:102)
02-03 16:53:14.312: E/AndroidRuntime(1043): at android.os.Looper.loop(Looper.java:135)
02-03 16:53:14.312: E/AndroidRuntime(1043): at android.app.ActivityThread.main(ActivityThread.java:5221)
02-03 16:53:14.312: E/AndroidRuntime(1043): at java.lang.reflect.Method.invoke(Native Method)
02-03 16:53:14.312: E/AndroidRuntime(1043): at java.lang.reflect.Method.invoke(Method.java:372)
02-03 16:53:14.312: E/AndroidRuntime(1043): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
02-03 16:53:14.312: E/AndroidRuntime(1043): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
02-03 16:53:14.312: E/AndroidRuntime(1043): Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
02-03 16:53:14.312: E/AndroidRuntime(1043): at android.support.v7.app.ActionBarActivityDelegate.onCreate(ActionBarActivityDelegate.java:151)
02-03 16:53:14.312: E/AndroidRuntime(1043): at android.support.v7.app.ActionBarActivityDelegateBase.onCreate(ActionBarActivityDelegateBase.java:138)
02-03 16:53:14.312: E/AndroidRuntime(1043): at android.support.v7.app.ActionBarActivity.onCreate(ActionBarActivity.java:123)
02-03 16:53:14.312: E/AndroidRuntime(1043): at com.example.splitbill.MainActivity.onCreate(MainActivity.java:16)
02-03 16:53:14.312: E/AndroidRuntime(1043): at android.app.Activity.performCreate(Activity.java:5933)
02-03 16:53:14.312: E/AndroidRuntime(1043): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
02-03 16:53:14.312: E/AndroidRuntime(1043): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
02-03 16:53:14.312: E/AndroidRuntime(1043): ... 10 more
答案 0 :(得分：1)
如果你看一下产生的错误，它会为你提供一个出错的提示
您需要使用Theme.AppCompat主题（或后代） 活性
请查看以下链接，了解有关您收到此错误的原因以及如何解决此问题的详细信息。
You need to use a Theme.AppCompat theme (or descendant) with this activity
答案 1 :(得分：0)
您需要将AppCompat支持库添加到依赖项下的gradle：
com.android.support:appcompat-v7:21.0.+
答案 2 :(得分：0)
Stacktrace告诉你
Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
这意味着您必须为AppComapt文件中的每项活动设置AndroidManifest主题
<activity
android:name=".ui.activity.MainActivity"
android:theme="@style/Theme.AppCompat"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
答案 3 :(得分：0)
日志中的关键信息是：
You need to use a Theme.AppCompat theme (or descendant) with this activity.
原因是：您的MainActivity基于ActionBarActivity，这是Android Support "appcompat" library中的一个类。在资源的某个地方，你有一个与这个库不兼容的主题。
如果您不需要支持较旧的Android版本（低至v7），则可以删除appcompat库并使用它：
public class MainActivity extends Activity {
...
}
（我将基类从ActionBarActivity替换为Activity）。
这应该解决你现在的问题。从长远来看，我建议你阅读：
Android Training也很早就引入了支持库的概念，所以它们也应该有用。