我是android开发人员的新手。我正在执行一个应用程序,但它给了我错误:不幸的是,'app_name'已停止
我的代码:
MainActivity
public class MainActivity extends ActionBarActivity {
private ListView lista;
//array de datos
private String[] datos = {"Item uno","Item dos","Item tres", "Item cuatro","Item cinco",
"Item seis","Item siete","Item ocho","Item nueve","Item diez"};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Referenciamos la lista a la actividad
lista = (ListView) findViewById(R.id.lista);
//creamos el arrayadapter
ArrayAdapter< String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, datos);
//Vinculamos el adaptador a la lista
lista.setAdapter(adapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.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();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
主要布局:
<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.cursoandroid.miarrayadapter.MainActivity"
tools:ignore="MergeRootFrame"
>
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/lista"
/>
清单:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.cursoandroid.miarrayadapter" >
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:theme="@style/AppTheme"
android:name=".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>
</FrameLayout>
我的字符串xml是:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">MiarrayAdapter</string>
<string name="hello_world">Hello world!</string>
<string name="action_settings">Settings</string>
</resources>
谢谢。有人能说我,错了吗?
文件logcat:
01-12 08:49:40.101 1253-1253/com.cursoandroid.miarrayadapter E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.cursoandroid.miarrayadapter, PID: 1253
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.cursoandroid.miarrayadapter/com.cursoandroid.miarrayadapter.MainActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
at android.support.v7.app.ActionBarActivityDelegate.onCreate(ActionBarActivityDelegate.java:151)
at android.support.v7.app.ActionBarActivityDelegateBase.onCreate(ActionBarActivityDelegateBase.java:138)
at android.support.v7.app.ActionBarActivity.onCreate(ActionBarActivity.java:123)
at com.cursoandroid.miarrayadapter.MainActivity.onCreate(MainActivity.java:16)
at android.app.Activity.performCreate(Activity.java:5933)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
答案 0 :(得分:0)
在styles.xml文件中,使用Appcompat主题:
<style name="**YourThemeName**" parent="@style/Theme.AppCompat">
</style>
现在在AndroidManifest.xml文件中使用此主题:
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/**YourThemeName**">
.....
</application>
答案 1 :(得分:0)
扩展ActionBarActivity
,需要Theme.AppCompat
。
所以请extends ActionBarActivity
extends Activity
或
喜欢这个
android:theme="@style/Theme.AppCompat" >
了解更多信息:
答案 2 :(得分:0)
开发时如果遇到任何异常,请先查看此部分&#34;引起:&#34;在堆栈跟踪中。它显示了失败的确切原因。
在这种情况下,它清楚地显示
Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
然后,您可以轻松调试自己或更有意义地提出问题。只是一个建议,因为你是一个新的开发人员