在我的应用程序中，用户可以通过按下按钮打开设置菜单（这是一个PreferenceActivity）。这在AVD上运行良好，但是当我尝试在真实设备上使用它时它不起作用。我不知道这是怎么发生的，我希望有人可以帮助我。
这是我的PreferenceActivity：
public class ActivityPref extends PreferenceActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.pref);
Preference preferences=findPreference("key");
preferences.setIntent(new Intent(this, PwdChange.class));
showNoti();
checkForBackUp();
}
private void checkForBackUp() {
final CheckBoxPreference cb = (CheckBoxPreference) getPreferenceManager().findPreference("backUp");
cb.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
@Override
public boolean onPreferenceClick(Preference preference) {
if(preference.isEnabled()){
final String inFileName = "/data/data/com.sus.pwd/databases/my_d";
String outFileName = Environment.getExternalStorageDirectory()+"/database_copy.db";
OutputStream output = null;
FileInputStream fis=null;
File dbFile = new File(inFileName);
try {
fis = new FileInputStream(dbFile);
output = new FileOutputStream(outFileName);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
// Transfer bytes from the inputfile to the outputfile
byte[] buffer = new byte[1024];
int length;
try {
while ((length = fis.read(buffer))>0){
try {
output.write(buffer, 0, length);
} catch (IOException e) {
e.printStackTrace();
}
}
} catch (IOException e) {
e.printStackTrace();
}
try {
output.flush();
output.close();
fis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return true;
}
});
}
private void showNoti() {
final CheckBoxPreference cb = (CheckBoxPreference) getPreferenceManager().findPreference("key1");
cb.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
@Override
public boolean onPreferenceChange(Preference preference, Object newValue) {
boolean myValue = (Boolean) newValue;
if (newValue.toString().equals("true")) {
Context context = getApplicationContext();
Toast.makeText(context, "start..", Toast.LENGTH_SHORT).show();
Log.e("value", String.valueOf(myValue));
NotificationCompat.Builder builder = (NotificationCompat.Builder) new NotificationCompat.Builder(context)
.setSmallIcon(R.drawable.delete);
Intent intent = new Intent(context, MainActivity.class);
PendingIntent pIntent = PendingIntent.getActivity(context, 1, intent, 0);
builder.setContentIntent(pIntent);
NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
Notification notif = builder.build();
mNotificationManager.notify(1, notif);
} else if (newValue.toString().equals("false")) {
Toast.makeText(getApplicationContext(), "stop..", Toast.LENGTH_SHORT).show();
NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
mNotificationManager.cancel(1);
}
return true;
}
});
}
}
这是我的主要活动：
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if(id==R.id.settings){
startActivity(new Intent(this, ActivityPref.class));
}
}
这是LogCat：
05-20 17:28:19.476 11771-11771/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.sushanta.reminderpwd, PID: 11771
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.sushanta.reminderpwd/com.sushanta.reminderpwd.ActivityPref}: android.view.InflateException: Binary XML file line #41: Error inflating class java.lang.reflect.Constructor
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2338)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1321)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5292)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:824)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:640)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.view.InflateException: Binary XML file line #41: Error inflating class java.lang.reflect.Constructor
at android.preference.GenericInflater.createItem(GenericInflater.java:397)
at android.preference.GenericInflater.onCreateItem(GenericInflater.java:417)
at android.preference.GenericInflater.createItemFromTag(GenericInflater.java:428)
at android.preference.GenericInflater.rInflate(GenericInflater.java:481)
at android.preference.GenericInflater.rInflate(GenericInflater.java:493)
at android.preference.GenericInflater.inflate(GenericInflater.java:326)
at android.preference.GenericInflater.inflate(GenericInflater.java:263)
at android.preference.PreferenceManager.inflateFromResource(PreferenceManager.java:276)
at android.preference.PreferenceActivity.addPreferencesFromResource(PreferenceActivity.java:1512)
at com.sushanta.reminderpwd.ActivityPref.onCreate(ActivityPref.java:29)
at android.app.Activity.performCreate(Activity.java:5264)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1088)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2302)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1321)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5292)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:824)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:640)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Constructor.constructNative(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at android.preference.GenericInflater.createItem(GenericInflater.java:383)
at android.preference.GenericInflater.onCreateItem(GenericInflater.java:417)
at android.preference.GenericInflater.createItemFromTag(GenericInflater.java:428)
at android.preference.GenericInflater.rInflate(GenericInflater.java:481)
at android.preference.GenericInflater.rInflate(GenericInflater.java:493)
at android.preference.GenericInflater.inflate(GenericInflater.java:326)
at android.preference.GenericInflater.inflate(GenericInflater.java:263)
at android.preference.PreferenceManager.inflateFromResource(PreferenceManager.java:276)
at android.preference.PreferenceActivity.addPreferencesFromResource(PreferenceActivity.java:1512)
at com.sushanta.reminderpwd.ActivityPref.onCreate(ActivityPref.java:29)
at android.app.Activity.performCreate(Activity.java:5264)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1088)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2302)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1321)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5292)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:824)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:640)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at android.content.res.AssetManager.getResourceTextArray(AssetManager.java:228)
at android.content.res.Resources.getTextArray(Resources.java:458)
at android.content.res.TypedArray.getTextArray(TypedArray.java:629)
at android.preference.ListPreference.<init>(ListPreference.java:51)
at java.lang.reflect.Constructor.constructNative(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at android.preference.GenericInflater.createItem(GenericInflater.java:383)
at android.preference.GenericInflater.onCreateItem(GenericInflater.java:417)
at android.preference.GenericInflater.createItemFromTag(GenericInflater.java:428)
at android.preference.GenericInflater.rInflate(GenericInflater.java:481)
at android.preference.GenericInflater.rInflate(GenericInflater.java:493)
at android.preference.GenericInflater.inflate(GenericInflater.java:326)
at android.preference.GenericInflater.inflate(GenericInflater.java:263)
at android.preference.PreferenceManager.inflateFromResource(PreferenceManager.java:276)
at android.preference.PreferenceActivity.addPreferencesFromResource(PreferenceActivity.java:1512)
at com.sushanta.reminderpwd.ActivityPref.onCreate(ActivityPref.java:29)
at android.app.Activity.performCreate(Activity.java:5264)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1088)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2302)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1321)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5292)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:824)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:640)
at dalvik.system.NativeStart.main(Native Method)
05-20 17:28:21.049 25577-25577/? E/NotificationService: unable to notify listener (removed): android.service.notification.INotificationListener$Stub$Proxy@428150b0
android.os.DeadObjectException
at android.os.BinderProxy.transact(Native Method)
at android.service.notification.INotificationListener$Stub$Proxy.onNotificationRemoved(INotificationListener.java:120)
at com.android.server.NotificationManagerService$NotificationListenerInfo.notifyRemovedIfUserMatch(NotificationManagerService.java:273)
at com.android.server.NotificationManagerService$3.run(NotificationManagerService.java:854)
at android.os.Handler.handleCallback(Handler.java:808)
at android.os.Handler.dispatchMessage(Handler.java:103)
at android.os.Looper.loop(Looper.java:193)
at com.android.server.ServerThread.initAndLoop(SystemServer.java:1452)
at com.android.server.SystemServer.main(SystemServer.java:1547)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:824)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:640)
at dalvik.system.NativeStart.main(Native Method)
// pref.xml
<Preference
android:title="Change Master password"
android:key="key"/>
<CheckBoxPreference
android:title="Notification on Action Bar"
android:key="key1"
android:defaultValue="true"/>
<CheckBoxPreference
android:title="Back up"
android:key="backUp"
android:summary="Load data to external device"
android:defaultValue="false"/>
<CheckBoxPreference
android:title="Auto Exit"
android:summary="The Application will automatically exit when the screen turns off"
android:defaultValue="true"/>