我最近向市场发布了一个应用程序。从开发者控制台来看,我的用户中大约有 1-2% 遇到了这个问题。 1-2% 的比例很小,但人们更倾向于在某些内容不起作用时留下评论,而不是在它起作用时留下评论,这可能会对下载产生负面影响。
不幸的是,开发人员控制台仅将平台列为“其他”,但我的应用程序可供使用 SDK 1.6+ 的用户使用。我也无法重现此问题,并且没有用户直接联系我,因此我无法获得有关出现故障的设备的更多信息。
这是堆栈
android.database.sqlite.SQLiteException: no such table: QUESTIONS: , while compiling: SELECT * FROM QUESTIONS WHERE DIFFICULTY=2 ORDER BY RANDOM() LIMIT 20
at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method)
at android.database.sqlite.SQLiteCompiledSql.compile(SQLiteCompiledSql.java:91)
at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:64)
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:80)
at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:46)
at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:53)
at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1434)
at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1404)
at com.app.myapp.db.DBHelper.getQuestionSet(DBHelper.java:140)
at com.app.myapp.SplashActivity.getQuestionSetFromDb(SplashActivity.java:109)
at com.app.myapp.SplashActivity.onClick(SplashActivity.java:58)
at android.view.View.performClick(View.java:2421)
at android.view.View$PerformClick.run(View.java:8867)
at android.os.Handler.handleCallback(Handler.java:587)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:143)
at android.app.ActivityThread.main(ActivityThread.java:5068)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
at dalvik.system.NativeStart.main(Native Method)
getQuestionSetFromDb(SplashActivity.java:109) 指的是
List<Question> questions = myDbHelper.getQuestionSet(diff, numQuestions);
指的是
public List<Question> getQuestionSet(int difficulty, int numQ){
List<Question> questionSet = new ArrayList<Question>();
Cursor c = myDataBase.rawQuery("SELECT * FROM QUESTIONS WHERE DIFFICULTY=" + difficulty +
" ORDER BY RANDOM() LIMIT " + numQ, null);
while (c.moveToNext()){
//Log.d("QUESTION", "Question Found in DB: " + c.getString(1));
Question q = new Question();
q.setQuestion(c.getString(1));
q.setAnswer(c.getString(2));
q.setOption1(c.getString(3));
q.setOption2(c.getString(4));
q.setOption3(c.getString(5));
q.setRating(difficulty);
questionSet.add(q);
}
return questionSet;
}
}
有谁知道可能的原因吗?奇怪的是,这种情况只发生在少量安装的情况下,并且无法确定他们正在使用的 SDK 级别/设备,这使得事情变得更加困难。
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编辑:根据回复,我包括了数据库的创建方式。
首先,我的活动有这个(这与导致崩溃的方法相同)
private List<Question> getQuestionSetFromDb() throws Error {
int diff = getDifficultySettings();
int numQuestions = getNumQuestions();
DBHelper myDbHelper = new DBHelper(this);
try {
myDbHelper.createDataBase();
} catch (IOException ioe) {
throw new Error("Unable to create database");
}
try {
myDbHelper.openDataBase();
}catch(SQLException sqle){
throw sqle;
}
List<Question> questions = myDbHelper.getQuestionSet(diff, numQuestions);
myDbHelper.close();
return questions;
}
myJOBhelper.create database() 调用
public void createDataBase() throws IOException{
boolean dbExist = checkDataBase();
if(!dbExist)
{
//By calling this method and empty database will be created into the default system path
//of your application so we are gonna be able to overwrite that database with our database.
this.getReadableDatabase();
try {
copyDataBase();
} catch (IOException e) {
throw new Error("Error copying database");
}
}
}
检查数据库()
private boolean checkDataBase(){
SQLiteDatabase checkDB = null;
try{
String myPath = DB_PATH + DB_NAME;
checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
}catch(SQLiteException e){
//database does't exist yet.
}
if(checkDB != null){
checkDB.close();
}
return checkDB != null ? true : false;
}
复制数据库()
private void copyDataBase() throws IOException{
//Open your local db as the input stream
InputStream myInput = myContext.getAssets().open(DB_NAME);
// Path to the just created empty db
String outFileName = DB_PATH + DB_NAME;
//Open the empty db as the output stream
OutputStream myOutput = new FileOutputStream(outFileName);
//transfer bytes from the inputfile to the outputfile
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer))>0){
myOutput.write(buffer, 0, length);
}
//Close the streams
myOutput.flush();
myOutput.close();
myInput.close();
}
变量
private static String DB_PATH = "/data/data/com.app.myapp/databases/";
private static String DB_NAME = "questionsDb";
private SQLiteDatabase myDataBase;
private final Context myContext;
抱歉,我真的应该一开始就把这个包括在内