Android崩溃 - 无法获取提供商

Question

失去了我的想法与此。我不断收到这个崩溃。之前在这里提过类似的问题，但我没有犯同样的错误。这里是我的清单：

<uses-sdk 
    android:minSdkVersion="11" 
    android:targetSdkVersion="15" /> 

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/> 
<uses-permission android:name="android.permission.WAKE_LOCK"/> 

<application 
    android:icon="@drawable/ic_launcher" 
    android:label="@string/app_name" 
    android:theme="@style/AppTheme" > 
    <activity 
     android:name=".ReminderListActivity" 
     android:label="@string/title_activity_reminder_list" > 
     <intent-filter> 
      <action android:name="android.intent.action.MAIN" /> 

      <category android:name="android.intent.category.LAUNCHER" /> 
     </intent-filter> 
    </activity> 
    <activity 
     android:name=".ReminderEditActivity" 
     android:label="@string/title_activity_reminder_edit" > 
    </activity> 
    <provider 
     android:name=".ReminderListProvider" 
     android:authorities="com.corsair.android.taskreminder.ReminderListProvider" >    
    </provider> 
</application> 

正如你所看到的，我有权力完全合格。我在我的权限代码中声明一个常数（并使用它，当我创建我的URI：

public static final String AUTHORITY = "com.corsair.android.taskreminder.ReminderListProvider"; 

// basic database info for creation 
public static final String DATABASE_NAME = "reminders.db"; 
public static final String DATABASE_TABLE_NAME = "reminders"; 
public static final int DATABASE_VERSION = 1; 

private ReminderListProviderMetaData() { 
} 

// inner class describing the Reminders Table 
// by implementing BaseColumns, we automatically get the _ID column 
// which is necessary for showing the DB contents in a ListView 
public static final class RemindersTableMetaData implements BaseColumns { 
    private RemindersTableMetaData() { 
    } 

    public static final String TABLE_NAME = "reminders"; 

    // uri and MIME type definitions 
    // info for database access 
    // the content URI is the authority prefixed with "content://" 
    public static final String BASE_PATH = "reminders"; 
    public static final Uri CONTENT_URI = Uri.parse("content://" 
      + AUTHORITY + "/" + BASE_PATH); 

这里是我的logcat：

08-01 18:11:10.111: I/dalvikvm(1150): threadid=3: reacting to signal 3 
    08-01 18:11:10.141: I/dalvikvm(1150): Wrote stack traces to '/data/anr/traces.txt' 
    08-01 18:11:10.481: I/dalvikvm(1150): threadid=3: reacting to signal 3 
    08-01 18:11:10.694: I/dalvikvm(1150): Wrote stack traces to '/data/anr/traces.txt' 
    08-01 18:11:11.951: I/Process(1150): Sending signal. PID: 1150 SIG: 9 
    08-01 18:12:50.231: I/dalvikvm(1196): threadid=3: reacting to signal 3 
    08-01 18:12:50.661: I/dalvikvm(1196): Wrote stack traces to '/data/anr/traces.txt' 
    08-01 18:12:50.671: I/dalvikvm(1196): threadid=3: reacting to signal 3 
    08-01 18:12:50.801: I/ActivityThread(1196): Pub         com.corsair.android.taskreminder.ReminderListProvider: com.corsair.android.taskreminder.ReminderListProvider 
    08-01 18:12:50.833: D/ReminderProvider(1196): main oncreate called 
    08-01 18:12:50.851: I/dalvikvm(1196): Wrote stack traces to '/data/anr/traces.txt' 
    08-01 18:12:50.871: D/ReminderProvider(1196): inner oncreate called 
    08-01 18:12:50.893: D/AndroidRuntime(1196): Shutting down VM 
    08-01 18:12:50.893: W/dalvikvm(1196): threadid=1: thread exiting with uncaught exception (group=0x409c01f8) 
    08-01 18:12:50.911: E/AndroidRuntime(1196): FATAL EXCEPTION: main 
    08-01 18:12:50.911: E/AndroidRuntime(1196): java.lang.RuntimeException: Unable to get provider com.corsair.android.taskreminder.ReminderListProvider: java.lang.NullPointerException 
    08-01 18:12:50.911: E/AndroidRuntime(1196):  at android.app.ActivityThread.installProvider(ActivityThread.java:4240) 
    08-01 18:12:50.911: E/AndroidRuntime(1196):  at android.app.ActivityThread.installContentProviders(ActivityThread.java:3992) 
    08-01 18:12:50.911: E/AndroidRuntime(1196):  at android.app.ActivityThread.handleBindApplication(ActivityThread.java:3946) 
    08-01 18:12:50.911: E/AndroidRuntime(1196):  at android.app.ActivityThread.access$1300(ActivityThread.java:123) 
    08-01 18:12:50.911: E/AndroidRuntime(1196):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1185) 
    08-01 18:12:50.911: E/AndroidRuntime(1196):  at android.os.Handler.dispatchMessage(Handler.java:99) 
    08-01 18:12:50.911: E/AndroidRuntime(1196):  at android.os.Looper.loop(Looper.java:137) 
    08-01 18:12:50.911: E/AndroidRuntime(1196):  at android.app.ActivityThread.main(ActivityThread.java:4424) 
    08-01 18:12:50.911: E/AndroidRuntime(1196):  at java.lang.reflect.Method.invokeNative(Native Method) 
    08-01 18:12:50.911: E/AndroidRuntime(1196):  at java.lang.reflect.Method.invoke(Method.java:511) 
    08-01 18:12:50.911: E/AndroidRuntime(1196):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
    08-01 18:12:50.911: E/AndroidRuntime(1196):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
    08-01 18:12:50.911: E/AndroidRuntime(1196):  at dalvik.system.NativeStart.main(Native Method) 
    08-01 18:12:50.911: E/AndroidRuntime(1196): Caused by: java.lang.NullPointerException 
    08-01 18:12:50.911: E/AndroidRuntime(1196):  at com.corsair.android.taskreminder.ReminderListProvider$DatabaseHelper.onCreate(ReminderListProvider.java:75) 
    08-01 18:12:50.911: E/AndroidRuntime(1196):  at com.corsair.android.taskreminder.ReminderListProvider.onCreate(ReminderListProvider.java:102) 
    08-01 18:12:50.911: E/AndroidRuntime(1196):  at android.content.ContentProvider.attachInfo(ContentProvider.java:944) 
    08-01 18:12:50.911: E/AndroidRuntime(1196):  at android.app.ActivityThread.installProvider(ActivityThread.java:4237) 
    08-01 18:12:50.911: E/AndroidRuntime(1196):  ... 12 more 
    08-01 18:12:51.241: I/dalvikvm(1196): threadid=3: reacting to signal 3 
    08-01 18:12:51.291: I/dalvikvm(1196): Wrote stack traces to '/data/anr/traces.txt' 
    08-01 18:12:51.541: I/dalvikvm(1196): threadid=3: reacting to signal 3 
    08-01 18:12:51.601: I/dalvikvm(1196): Wrote stack traces to '/data/anr/traces.txt' 
    08-01 18:12:58.262: I/Process(1196): Sending signal. PID: 1196 SIG: 9 

这里是线75（在logcat中提到）：

@Override 
public void onCreate(SQLiteDatabase db) { 
Log.d(TAG, "inner oncreate called"); 
db.execSQL(RemindersTableMetaData.DATABASE_CREATE_SCHEMA); 
} 

这里是DATABASE_CREATE_SCHEMA：

public static final String DATABASE_CREATE_SCHEMA = "create table " 
+ DATABASE_TABLE_NAME + " (" + RemindersTableMetaData._ID 
+ " integer primary key autoincrement, " + REMINDER_TITLE 
+ " text not null, " + REMINDER_BODY + " text not null, " 
+ REMINDER_DATE_TIME + " text not null" + ");"; 

这里是我的ContentProvider的onCreate（）：

// database helper member variable 
private DatabaseHelper mOpenHelper; 
private SQLiteDatabase db; 
// component creation callback 
@Override 
public boolean onCreate() { 
Log.d(TAG, "main oncreate called"); 
mOpenHelper = new DatabaseHelper(getContext()); 
mOpenHelper.onCreate(db); 
return true; 
} 

这里是我的DataBaseHelper的构造：

// this class helps open, create, and upgrade the database 
private static class DatabaseHelper extends SQLiteOpenHelper { 
public DatabaseHelper(Context context) { 
super(context, ReminderListProviderMetaData.DATABASE_NAME, null, 
ReminderListProviderMetaData.DATABASE_VERSION); 
} 

真的在这里我束手无策。谢谢你的帮助。

Answer 1

我觉得我看到你的ContentProvider，我的意见细节变化的问题：

public boolean onCreate() { 
    Log.d(TAG, "main oncreate called"); 
    mOpenHelper = new DatabaseHelper(getContext()); 

    /* Remove this line next line: 
    * 1) db is null 
    * 2) DatabaseHelper's constructor already silently calls this 
    */ 
    //mOpenHelper.onCreate(db); 

    return true; 
}