当我从菜单中选择pref时出现以下错误，我的应用程序崩溃了。
04-25 11:02:01.177: D/AndroidRuntime(888): Shutting down VM
04-25 11:02:01.177: W/dalvikvm(888): threadid=1: thread exiting with uncaught exception (group=0x40a70930)
04-25 11:02:01.227: E/AndroidRuntime(888): FATAL EXCEPTION: main
04-25 11:02:01.227: E/AndroidRuntime(888): android.content.ActivityNotFoundException: No Activity found to handle Intent { act=com.thenewboston.travis.prefs }
04-25 11:02:01.227: E/AndroidRuntime(888): at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1622)
04-25 11:02:01.227: E/AndroidRuntime(888): at android.app.Instrumentation.execStartActivity(Instrumentation.java:1417)
04-25 11:02:01.227: E/AndroidRuntime(888): at android.app.Activity.startActivityForResult(Activity.java:3370)
04-25 11:02:01.227: E/AndroidRuntime(888): at android.app.Activity.startActivityForResult(Activity.java:3331)
04-25 11:02:01.227: E/AndroidRuntime(888): at android.app.Activity.startActivity(Activity.java:3566)
04-25 11:02:01.227: E/AndroidRuntime(888): at android.app.Activity.startActivity(Activity.java:3534)
04-25 11:02:01.227: E/AndroidRuntime(888): at com.thenewboston.travis.Menu.onOptionsItemSelected(Menu.java:65)
04-25 11:02:01.227: E/AndroidRuntime(888): at android.app.Activity.onMenuItemSelected(Activity.java:2548)
04-25 11:02:01.227: E/AndroidRuntime(888): at com.android.internal.policy.impl.PhoneWindow.onMenuItemSelected(PhoneWindow.java:980)
04-25 11:02:01.227: E/AndroidRuntime(888): at com.android.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:735)
04-25 11:02:01.227: E/AndroidRuntime(888): at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:149)
04-25 11:02:01.227: E/AndroidRuntime(888): at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:874)
04-25 11:02:01.227: E/AndroidRuntime(888): at com.android.internal.view.menu.ListMenuPresenter.onItemClick(ListMenuPresenter.java:166)
04-25 11:02:01.227: E/AndroidRuntime(888): at android.widget.AdapterView.performItemClick(AdapterView.java:298)
04-25 11:02:01.227: E/AndroidRuntime(888): at android.widget.AbsListView.performItemClick(AbsListView.java:1100)
04-25 11:02:01.227: E/AndroidRuntime(888): at android.widget.AbsListView$PerformClick.run(AbsListView.java:2749)
04-25 11:02:01.227: E/AndroidRuntime(888): at android.widget.AbsListView$1.run(AbsListView.java:3423)
04-25 11:02:01.227: E/AndroidRuntime(888): at android.os.Handler.handleCallback(Handler.java:725)
04-25 11:02:01.227: E/AndroidRuntime(888): at android.os.Handler.dispatchMessage(Handler.java:92)
04-25 11:02:01.227: E/AndroidRuntime(888): at android.os.Looper.loop(Looper.java:137)
04-25 11:02:01.227: E/AndroidRuntime(888): at android.app.ActivityThread.main(ActivityThread.java:5039)
04-25 11:02:01.227: E/AndroidRuntime(888): at java.lang.reflect.Method.invokeNative(Native Method)
04-25 11:02:01.227: E/AndroidRuntime(888): at java.lang.reflect.Method.invoke(Method.java:511)
04-25 11:02:01.227: E/AndroidRuntime(888): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-25 11:02:01.227: E/AndroidRuntime(888): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-25 11:02:01.227: E/AndroidRuntime(888): at dalvik.system.NativeStart.main(Native Method)
首选项enter code here。XML
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >
<EditTextPreference
android:title="EditText"
android:key="name"
android:summary="Enter Your Name"
></EditTextPreference>
<CheckBoxPreference
android:title="CheckkBox"
android:defaultValue="true"
android:key="checkbox"
android:summary="Check This box">
</CheckBoxPreference>
<ListPreference `enter code here`
android:title="list"
android:key="list"
android:summary="This is a list to choose from"
android:entries="@array/list"
android:entryValues="@array/lValues">
</ListPreference>
</PreferenceScreen>
prefs.java
package com.thenewboston.travis;
import android.os.Bundle;
import android.preference.PreferenceActivity;
public class prefs extends PreferenceActivity{
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.prefs);
}
}
menu.java
package com.thenewboston.travis;
import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class Menu extends ListActivity{
String classes[] = {"StartingPoint","TextPlay","Email","Camera",
"Data","example5","example6","example7"};
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setListAdapter(new ArrayAdapter<String>(Menu.this, android.R.layout.simple_list_item_1, classes));
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
// TODO Auto-generated method stub
super.onListItemClick(l, v, position, id);
String cheese = classes[position];
try {
Class ourClass = Class.forName("com.thenewboston.travis."+cheese);
Intent ourIntent = new Intent(Menu.this,ourClass);
startActivity(ourIntent);
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public boolean onCreateOptionsMenu(android.view.Menu menu) {
// TODO Auto-generated method stub
super.onCreateOptionsMenu(menu);
MenuInflater blowUp = getMenuInflater();
blowUp.inflate(R.menu.cool_menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
switch(item.getItemId()){
case R.id.aboutMe:
Intent i = new Intent("com.thenewboston.travis.About");
startActivity(i);
break;
case R.id.preferences :
Intent i1 = new Intent("com.thenewboston.travis.prefs");
startActivity(i1);
break;
case R.id.exit:
finish();
break;
}
return false;
}
}
的AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.thenewboston.travis"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="10"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.SET_WALLPAPER"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="KCRaju"
android:theme="@style/AppTheme">
<activity
android:name="com.thenewboston.travis.Splash"
android:label="KCRaju"
android:screenOrientation="portrait" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".StartingPoint"
android:label="KCRaju" >
<intent-filter>
<action android:name="com.thenewboston.travis.STARTINGPOINT" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".Menu"
android:label="KCRaju" >
<intent-filter>
<action android:name="com.thenewboston.travis.MENU" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".prefs"
android:label="KCRaju" >
<intent-filter>
<action android:name="com.thenewboston.travis.PREFS" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".About"
android:label="KCRaju"
android:theme="@android:style/Theme.Dialog" >
<intent-filter>
<action android:name="com.thenewboston.travis.About" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity android:name=".TextPlay" android:label="@string/app_name" >
</activity>
<activity android:name=".Email" android:label="@string/app_name" >
</activity>
<activity android:name=".Camera" android:label="@string/app_name" android:screenOrientation="portrait" >
</activity>
<activity android:name=".Data" android:label="@string/app_name" android:screenOrientation="portrait" >
</activity>
<activity android:name=".OpenedClass" android:label="@string/app_name" android:screenOrientation="portrait" >
</activity>
</application>
</manifest>
答案 0 :(得分：0)
您不匹配用于启动活动的Action字符串的大小写：
Intent i1 = new Intent("com.thenewboston.travis.prefs");
startActivity(i1);
与你在Manifest中声明的内容相比：
<activity
android:name=".prefs"
android:label="KCRaju" >
<intent-filter>
<action android:name="com.thenewboston.travis.PREFS" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
因此，您正在使用操作"com.thenewboston.travis.prefs"创建一个意图，但您的IntentFilter将匹配"com.thenewboston.travis.PREFS"。
或者，尝试从Manifest中的<intent-filter>声明中删除prefs，然后更改启动它的方式：
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
switch(item.getItemId()){
case R.id.aboutMe:
Intent i = new Intent(this, About.class);
startActivity(i);
break;
case R.id.preferences :
Intent i1 = new Intent(this, prefs.class);
startActivity(i1);
break;
case R.id.exit:
finish();
break;
}
return false;
答案 1 :(得分：0)
在您的清单中，您将活动操作声明为：
<activity
android:name=".prefs"
android:label="KCRaju" >
<intent-filter>
<action android:name="com.thenewboston.travis.PREFS" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
请注意大写字母中的PREFS ..在您的代码中，您使用的是小案例prefs：
case R.id.preferences :
Intent i1 = new Intent("com.thenewboston.travis.prefs");
startActivity(i1);
break;
尝试使用大写字母PREFS，如下面的代码所示：
case R.id.preferences :
Intent i1 = new Intent("com.thenewboston.travis.PREFS");
startActivity(i1);
break;