Question

我创建了一个名为Menu的类。当用户按下菜单按钮时，它们会显示3个选项，即。关于，偏好和退出。当他们点击偏好时，应该打开偏好动作。但是，应用程序崩溃并且无法打开首选项活动。我发布了ListActivity，我试图在清单和日志文件中打开的活动的活动标记。请帮忙。

public class Menu extends ListActivity {
    String[] list = { "StartView", "FunWithText", "Email", "Camera",
            "ActivityStarter" };

    @Override
    protected void onListItemClick(ListView l, View v, int position, long id) {
        super.onListItemClick(l, v, position, id);
        try {
            Class myClass = Class.forName("com.thenewboston.terry."
                    + list[position]);
            Intent myIntent = new Intent(Menu.this, myClass);
            startActivity(myIntent);

        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }

    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setListAdapter(new ArrayAdapter<String>(Menu.this,
                android.R.layout.simple_list_item_1, list));

    }

    @Override
    public boolean onCreateOptionsMenu(android.view.Menu menu) {

        super.onCreateOptionsMenu(menu);
        MenuInflater balloon = getMenuInflater();
        balloon.inflate(R.menu.menu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case (R.id.about):
            Intent myIntent = new Intent(Menu.this, Dialogue.class);
            startActivity(myIntent);
            break;
        case (R.id.preferences):
            Intent prefs = new Intent(Menu.this, Preferences.class);
            startActivity(prefs);
            break;
        case (R.id.exit):
            finish();
            break;

        }
        return false;
    }

}

的Manifest.xml：

    <activity
        android:name=".Preferences"
        android:label="Start Activity"
        android:theme="@android:style/Theme.Dialog" >



        <intent-filter>
            <action android:name="com.thenewboston.terry.PREFS" />

            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </activity>

<小时/> 错误日志：

07-18 00:39:07.133: E/AndroidRuntime(738): FATAL EXCEPTION: main
07-18 00:39:07.133: E/AndroidRuntime(738): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.thenewboston.terry/com.thenewboston.terry.Preferences}: android.view.InflateException: Binary XML file line #14: Error inflating class listPreference
07-18 00:39:07.133: E/AndroidRuntime(738):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
07-18 00:39:07.133: E/AndroidRuntime(738):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
07-18 00:39:07.133: E/AndroidRuntime(738):  at android.app.ActivityThread.access$2300(ActivityThread.java:125)
07-18 00:39:07.133: E/AndroidRuntime(738):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
07-18 00:39:07.133: E/AndroidRuntime(738):  at android.os.Handler.dispatchMessage(Handler.java:99)
07-18 00:39:07.133: E/AndroidRuntime(738):  at android.os.Looper.loop(Looper.java:123)
07-18 00:39:07.133: E/AndroidRuntime(738):  at android.app.ActivityThread.main(ActivityThread.java:4627)
07-18 00:39:07.133: E/AndroidRuntime(738):  at java.lang.reflect.Method.invokeNative(Native Method)
07-18 00:39:07.133: E/AndroidRuntime(738):  at java.lang.reflect.Method.invoke(Method.java:521)
07-18 00:39:07.133: E/AndroidRuntime(738):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
07-18 00:39:07.133: E/AndroidRuntime(738):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
07-18 00:39:07.133: E/AndroidRuntime(738):  at dalvik.system.NativeStart.main(Native Method)
07-18 00:39:07.133: E/AndroidRuntime(738): Caused by: android.view.InflateException: Binary XML file line #14: Error inflating class listPreference
07-18 00:39:07.133: E/AndroidRuntime(738):  at android.preference.GenericInflater.createItemFromTag(GenericInflater.java:441)
07-18 00:39:07.133: E/AndroidRuntime(738):  at android.preference.GenericInflater.rInflate(GenericInflater.java:481)
07-18 00:39:07.133: E/AndroidRuntime(738):  at android.preference.GenericInflater.inflate(GenericInflater.java:326)
07-18 00:39:07.133: E/AndroidRuntime(738):  at android.preference.GenericInflater.inflate(GenericInflater.java:263)
07-18 00:39:07.133: E/AndroidRuntime(738):  at android.preference.PreferenceManager.inflateFromResource(PreferenceManager.java:251)
07-18 00:39:07.133: E/AndroidRuntime(738):  at android.preference.PreferenceActivity.addPreferencesFromResource(PreferenceActivity.java:262)
07-18 00:39:07.133: E/AndroidRuntime(738):  at com.thenewboston.terry.Preferences.onCreate(Preferences.java:12)
07-18 00:39:07.133: E/AndroidRuntime(738):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
07-18 00:39:07.133: E/AndroidRuntime(738):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
07-18 00:39:07.133: E/AndroidRuntime(738):  ... 11 more
07-18 00:39:07.133: E/AndroidRuntime(738): Caused by: java.lang.ClassNotFoundException: android.preference.listPreference in loader dalvik.system.PathClassLoader[/data/app/com.thenewboston.terry-1.apk]
07-18 00:39:07.133: E/AndroidRuntime(738):  at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243)
07-18 00:39:07.133: E/AndroidRuntime(738):  at java.lang.ClassLoader.loadClass(ClassLoader.java:573)
07-18 00:39:07.133: E/AndroidRuntime(738):  at java.lang.ClassLoader.loadClass(ClassLoader.java:532)
07-18 00:39:07.133: E/AndroidRuntime(738):  at android.preference.GenericInflater.createItem(GenericInflater.java:375)
07-18 00:39:07.133: E/AndroidRuntime(738):  at android.preference.GenericInflater.onCreateItem(GenericInflater.java:417)
07-18 00:39:07.133: E/AndroidRuntime(738):  at android.preference.GenericInflater.createItemFromTag(GenericInflater.java:428)
07-18 00:39:07.133: E/AndroidRuntime(738):  ... 19 more

**Preferences xml:**

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen
  xmlns:android="http://schemas.android.com/apk/res/android">
  <PreferenceCategory android:title="Label">    
    <EditTextPreference 
    android:title="EditText"
    android:key="name"
    android:summary="Enter your name"/>

    <CheckBoxPreference
    android:title="checkBox"
    android:key="music"
    android:defaultValue="true"
    android:summary="music on?"
    />
    <listPreference
    android:title="list"
    android:key="list"
    android:summary="Choose somethign"
    android:entries="@array/list"
    android:entryValues="@array/values"
   />
  </PreferenceCategory>
 </PreferenceScreen>

public class Preferences extends PreferenceActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.prefs);
    }

}

Answer 1

我认为您的Preferences.xml需要如下所示：

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen
  xmlns:android="http://schemas.android.com/apk/res/android">
  <PreferenceCategory android:title="Label">    
    <EditTextPreference 
    android:title="EditText"
    android:key="name"
    android:summary="Enter your name"/>

    <CheckBoxPreference
    android:title="checkBox"
    android:key="music"
    android:defaultValue="true"
    android:summary="music on?"
    />
    <ListPreference
    android:title="list"
    android:key="list"
    android:summary="Choose somethign"
    android:entries="@array/list"
    android:entryValues="@array/values"
   />
  </PreferenceCategory>
 </PreferenceScreen>

Answer 2

事实证明，应用于PreferenceActivity的主题与PreferenceActivity对象不兼容。感谢所有试图提供帮助的人。

无法从菜单中启动preferenceActivity

2 个答案: