我正在尝试创建一个prefrence acivity但它不起作用。我不知道isue是否在方法“addPreferencesFromResource（R.xml.preferencia）;”被剥夺了。
编辑：我在清单上声明了错误的名称。我正在声明preferencia.xml而不是prefres.java。
主要活动：
public class Asteroides extends ActionBarActivity {
private MediaPlayer player;
private Button boton1;
private Button boton2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
boton1 = (Button) findViewById(R.id.button1);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
player = MediaPlayer.create(this, R.raw.audio);
player.start();
}
}
@Override
protected void onPause() {
super.onPause();
player.stop();
if (isFinishing()){
player.stop();
player.release();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.asteroides, menu);
return true;
}
public void play(View v ){
Intent i = new Intent(Asteroides.this,prefers.class);
startActivity(i);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.conf:
startActivity(new Intent(Asteroides.this,
prefers.class));
return true;
case R.id.about:
startActivity(new Intent(Asteroides.this,
MainActivity.class));
return true;
default:
return super.onOptionsItemSelected(item);
}
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
}
}
主xml：
<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="uf3.asteroides.Asteroides"
tools:ignore="MergeRootFrame" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="35dp"
android:background="@drawable/back"
android:orientation="vertical" >
<TextView
android:id="@+id/textView1"
android:layout_width="203dp"
android:layout_height="40dp"
android:layout_marginLeft="80dp"
android:layout_marginTop="80dp"
android:text="@string/asteroid"
android:textColor="#CC0000"
android:textSize="30sp" />
<Button
android:id="@+id/button1"
android:layout_width="210dp"
android:layout_height="40dp"
android:layout_marginLeft="50dp"
android:layout_marginTop="20dp"
android:drawableLeft="@drawable/play"
android:onClick="play"
android:text="@string/jugar"
android:textSize="15sp" />
<Button
android:id="@+id/button2"
android:layout_width="210dp"
android:layout_height="40dp"
android:layout_marginLeft="50dp"
android:layout_marginTop="20dp"
android:drawableLeft="@drawable/p"
android:text="@string/puntuacion"
android:textSize="15sp" />
</LinearLayout>
</FrameLayout>
prefers.java
import android.os.Bundle;
import android.preference.PreferenceActivity;
public class prefers extends PreferenceActivity{
@SuppressWarnings("deprecation")
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferencia);
}
}
prefrencia.xml：
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >
<PreferenceCategory android:title="Category1" >
<CheckBoxPreference
android:defaultValue="false"
android:key="checkboxPref"
android:summary="True or False"
android:title="Checkbox" />
</PreferenceCategory>
<PreferenceCategory android:title="Category2" >
<EditTextPreference
android:defaultValue="[Introduce un string aqui]"
android:key="EditTextPref"
android:summary="Introduce un String"
android:title="EditText" />
<RingtonePreference
android:key="ringtonePref"
android:summary="Selecciona un Tono"
android:title="RingTones" />
<PreferenceScreen
android:key="secondPrefScreenPref"
android:summary="Pulse aquí para ir a la segunda pantalla de Preferencias"
android:title="Segunda Pantalla Preferencias" >
<EditTextPreference
android:key="secondEditTextPref"
android:summary="Introduce un String"
android:title="EditText (Segunda Pantalla)" />
</PreferenceScreen>
</PreferenceCategory>
</PreferenceScreen>
menu.xml
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
tools:context="uf3.asteroides.Asteroides" >
<item
android:id="@+id/conf"
android:orderInCategory="100"
android:title="Configuración"
android:icon="@drawable/set"
app:showAsAction="never"
/>
<item
android:id="@+id/about"
android:orderInCategory="100"
android:title="A cerca de..."
android:icon="@drawable/ic"
app:showAsAction="never"/>
</menu>
logcat：
05-03 17:23:50.076: E/AndroidRuntime(2095): FATAL EXCEPTION: main
05-03 17:23:50.076: E/AndroidRuntime(2095): Process: uf3.asteroides, PID: 2095
05-03 17:23:50.076: E/AndroidRuntime(2095): java.lang.IllegalStateException: Could not execute method of the activity
05-03 17:23:50.076: E/AndroidRuntime(2095): at android.view.View$1.onClick(View.java:3823)
05-03 17:23:50.076: E/AndroidRuntime(2095): at android.view.View.performClick(View.java:4438)
05-03 17:23:50.076: E/AndroidRuntime(2095): at android.view.View$PerformClick.run(View.java:18422)
05-03 17:23:50.076: E/AndroidRuntime(2095): at android.os.Handler.handleCallback(Handler.java:733)
05-03 17:23:50.076: E/AndroidRuntime(2095): at android.os.Handler.dispatchMessage(Handler.java:95)
05-03 17:23:50.076: E/AndroidRuntime(2095): at android.os.Looper.loop(Looper.java:136)
05-03 17:23:50.076: E/AndroidRuntime(2095): at android.app.ActivityThread.main(ActivityThread.java:5017)
05-03 17:23:50.076: E/AndroidRuntime(2095): at java.lang.reflect.Method.invokeNative(Native Method)
05-03 17:23:50.076: E/AndroidRuntime(2095): at java.lang.reflect.Method.invoke(Method.java:515)
05-03 17:23:50.076: E/AndroidRuntime(2095): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
05-03 17:23:50.076: E/AndroidRuntime(2095): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
05-03 17:23:50.076: E/AndroidRuntime(2095): at dalvik.system.NativeStart.main(Native Method)
05-03 17:23:50.076: E/AndroidRuntime(2095): Caused by: java.lang.reflect.InvocationTargetException
05-03 17:23:50.076: E/AndroidRuntime(2095): at java.lang.reflect.Method.invokeNative(Native Method)
05-03 17:23:50.076: E/AndroidRuntime(2095): at java.lang.reflect.Method.invoke(Method.java:515)
05-03 17:23:50.076: E/AndroidRuntime(2095): at android.view.View$1.onClick(View.java:3818)
05-03 17:23:50.076: E/AndroidRuntime(2095): ... 11 more
05-03 17:23:50.076: E/AndroidRuntime(2095): Caused by: android.content.ActivityNotFoundException: Unable to find explicit activity class {uf3.asteroides/uf3.asteroides.prefers}; have you declared this activity in your AndroidManifest.xml?
05-03 17:23:50.076: E/AndroidRuntime(2095): at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1628)
05-03 17:23:50.076: E/AndroidRuntime(2095): at android.app.Instrumentation.execStartActivity(Instrumentation.java:1424)
05-03 17:23:50.076: E/AndroidRuntime(2095): at android.app.Activity.startActivityForResult(Activity.java:3424)
05-03 17:23:50.076: E/AndroidRuntime(2095): at android.app.Activity.startActivityForResult(Activity.java:3385)
05-03 17:23:50.076: E/AndroidRuntime(2095): at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:839)
05-03 17:23:50.076: E/AndroidRuntime(2095): at android.app.Activity.startActivity(Activity.java:3627)
05-03 17:23:50.076: E/AndroidRuntime(2095): at android.app.Activity.startActivity(Activity.java:3595)
05-03 17:23:50.076: E/AndroidRuntime(2095): at uf3.asteroides.Asteroides.play(Asteroides.java:68)
05-03 17:23:50.076: E/AndroidRuntime(2095): ... 14 more
清单：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="uf3.asteroides"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="7"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.GET_TASKS" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="uf3.asteroides.Asteroides"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="uf3.asteroides.preferencia" />
<activity
android:name="uf3.asteroides.MainActivity"
android:label="@string/title_activity_main" >
</activity>
<activity
android:name="uf3.asteroides.Puntuaciones"
android:label="@string/title_activity_puntuaciones" >
</activity>
</application>
</manifest>
任何帮助将不胜感激..
答案 0 :(得分：1)
看看logcat中的这一行：
Caused by: android.content.ActivityNotFoundException:
Unable to find explicit activity class {uf3.asteroides/uf3.asteroides.prefers};
have you declared this activity in your AndroidManifest.xml?
==＆GT;好像您忘了在AndroidManifest中声明PreferenceActivity。