我有一个非常奇怪的问题。我在使用 SherlockActionBar 时成功设置了上下文操作栏。当我选择其中一个操作模式按钮时，显示吐司消息可以正常工作。当我用我的方法调用交换它时saveRing()，我会强制关闭。错误必须在我的saveRing()方法之内，但我无法弄清楚。saveRing当我从弹出的上下文菜单中调用它时，该方法运行良好。
我的保存环（）：
public boolean saveRing(int raw_resource, String title) {
byte[] buffer = null;
InputStream fIn = getBaseContext().getResources()
.openRawResource(raw_resource);
int size = 0;
try {
size = fIn.available();
buffer = new byte[size];
fIn.read(buffer);
fIn.close();
} catch (IOException e) {
// TODO Auto-generated catch block
return false;
}
String path = "/sdcard/media/audio/ringtones/";
String filename = title + ".mp3";
boolean exists = (new File(path)).exists();
if (!exists) {
new File(path).mkdirs();
}
FileOutputStream save;
try {
save = new FileOutputStream(path + filename);
save.write(buffer);
save.flush();
save.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return false;
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return false;
}
sendBroadcast(
new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri
.parse("file://" + path + filename)));
File k = new File(path, filename);
ContentValues values = new ContentValues();
values.put(MediaStore.MediaColumns.DATA, k.getAbsolutePath());
values.put(MediaStore.MediaColumns.TITLE, title);
values.put(MediaStore.MediaColumns.MIME_TYPE, "audio/mp3");
values.put(MediaStore.Audio.Media.ARTIST, "Epic Meal Time ");
values.put(MediaStore.Audio.Media.IS_RINGTONE, true);
values.put(MediaStore.Audio.Media.IS_NOTIFICATION, false);
values.put(MediaStore.Audio.Media.IS_ALARM, false);
values.put(MediaStore.Audio.Media.IS_MUSIC, false);
Uri pURI = MediaStore.Audio.Media.getContentUriForPath(k
.getAbsolutePath());
// remove entry every time so we don't get duplicate entries and have a
// problem setting a 2nd time
getContentResolver().delete(
pURI,
MediaStore.MediaColumns.DATA + "=\"" + k.getAbsolutePath()
+ "\"", null);
Uri nURI = getContentResolver().insert(pURI,
values);
RingtoneManager.setActualDefaultRingtoneUri(this,
RingtoneManager.TYPE_RINGTONE, nURI);
Toast.makeText(this, title + " Ringtone set",
Toast.LENGTH_LONG).show();
return true;
}
日志猫：
02-19 21:38:47.691: E/AndroidRuntime(20492): FATAL EXCEPTION: main
02-19 21:38:47.691: E/AndroidRuntime(20492): java.lang.NullPointerException
02-19 21:38:47.691: E/AndroidRuntime(20492): at vartanian.android.epicmealtimepro.Tab3Fragment$mActionModeCallback.onActionItemClicked(Tab3Fragment.java:346)
02-19 21:38:47.691: E/AndroidRuntime(20492): at com.actionbarsherlock.internal.ActionBarSherlockNative$ActionModeCallbackWrapper.onActionItemClicked(ActionBarSherlockNative.java:243)
02-19 21:38:47.691: E/AndroidRuntime(20492): at com.android.internal.policy.impl.PhoneWindow$DecorView$ActionModeCallbackWrapper.onActionItemClicked(PhoneWindow.java:2552)
02-19 21:38:47.691: E/AndroidRuntime(20492): at com.android.internal.app.ActionBarImpl$ActionModeImpl.onMenuItemSelected(ActionBarImpl.java:931)
02-19 21:38:47.691: E/AndroidRuntime(20492): at com.android.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:735)
02-19 21:38:47.691: E/AndroidRuntime(20492): at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:149)
02-19 21:38:47.691: E/AndroidRuntime(20492): at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:874)
02-19 21:38:47.691: E/AndroidRuntime(20492): at com.android.internal.view.menu.ActionMenuView.invokeItem(ActionMenuView.java:514)
02-19 21:38:47.691: E/AndroidRuntime(20492): at com.android.internal.view.menu.ActionMenuItemView.onClick(ActionMenuItemView.java:99)
02-19 21:38:47.691: E/AndroidRuntime(20492): at android.view.View.performClick(View.java:4091)
02-19 21:38:47.691: E/AndroidRuntime(20492): at android.view.View$PerformClick.run(View.java:17036)
02-19 21:38:47.691: E/AndroidRuntime(20492): at android.os.Handler.handleCallback(Handler.java:615)
02-19 21:38:47.691: E/AndroidRuntime(20492): at android.os.Handler.dispatchMessage(Handler.java:92)
02-19 21:38:47.691: E/AndroidRuntime(20492): at android.os.Looper.loop(Looper.java:137)
02-19 21:38:47.691: E/AndroidRuntime(20492): at android.app.ActivityThread.main(ActivityThread.java:4962)
02-19 21:38:47.691: E/AndroidRuntime(20492): at java.lang.reflect.Method.invokeNative(Native Method)
02-19 21:38:47.691: E/AndroidRuntime(20492): at java.lang.reflect.Method.invoke(Method.java:511)
02-19 21:38:47.691: E/AndroidRuntime(20492): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
02-19 21:38:47.691: E/AndroidRuntime(20492): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556)
02-19 21:38:47.691: E/AndroidRuntime(20492): at dalvik.system.NativeStart.main(Native Method)
02-19 21:38:49.262: I/Process(20492): Sending signal. PID: 20492 SIG: 9
谢谢！编辑：这是我在第 346 行的代码：ma.saveRing(R.raw.quaq_language, values[2]);
有错误的行取决于 ListFragment 中的哪个项目调用 CAB。我用这样的switch语句设置它：
case R.id.ringtone:
switch (viewId) {
case 0:
ma.saveRing(R.raw.ohhh_gurllll, values[0]);
break;
case 1:
ma.saveRing(R.raw.pork_balls, values[1]);
break;
viewId是 ListFragment 中的位置。问题似乎是 values[] 为空，但我不知道为什么。这是它被初始化的地方：
public class Tab3Fragment extends SherlockListFragment {
String[] values = new String[] { "Ohh Gurl", "Pork Balls", "Language",
"Really Good Idea", "Rice Paper Bacon Condom",
"Rise and Shine", "Roll One Up Homie",
"Save The Hate For Twitter", "Snap, Crackle, Pop",
"Let's Get Girls", "Spanish",
"We Make Steak Look Like Cabbage", "Wake Up McDonalds",
"Super Moist", "Stupid, Tasty Birds", "Bacon Moment",
"Today We Eat Smart", "We Are Gonna Die On Youtube",
"Drunk Off Pancakes", "Ketchup", "We Eat All Our Babies",
"Maximum Meat Experience", "Stop Hating", "What Up Bitches",
"Whatcha Know About Bullets",
"Whatcha Know About Terrible Food", "CANADA", "Beiber Concert",
"Ending Riceism", "You Ain't Got What We Got", "F*cking Noob",
"Constructed Meat Base", "Want Some Of These Nuts" };
这是填充数组适配器的字符串数组。