在这个应用程序中，我想从使用Firefox sqlite manager创建的db中获取问题。
当我运行代码时，错误日志中出现 db locked ，我无法在textview中显示内容。
AptitudeActivity
public class AptitudeActivity extends Activity implements OnClickListener {
private Button next;
private Button previous;
private TextView qdisply,adisplay;
int counter=0;
private String v;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
next = (Button)findViewById(R.id.button1);
previous = (Button)findViewById(R.id.button2);
qdisply = (TextView)findViewById(R.id.textView1);
adisplay = (TextView)findViewById(R.id.textView2);
next.setOnClickListener(this);
previous.setOnClickListener(this);
}
public void onClick(View arg) {
switch(arg.getId())
{
case R.id.button1:
counter++;
upper up=new upper(this);
up.open();
// here i want to display based on the counter value which will be +1 when the button is clicked
up.close();
break;
case R.id.button2:
//not defined till now
break;
}
}
}
insertq
public class upper {
static String path;
insertq q;
private String dispa;
String dispq;
static SQLiteDatabase db1;
static Context ourcontext;
static String mydb = "APTITUDE.sqlite";
static Boolean dbchk;
private static class insertq extends SQLiteOpenHelper {
private String dbpath;
public insertq(Context context) {
super(context, mydb, null, 1);
path = "/data/data/"
+ context.getApplicationContext().getPackageName()
+ "/databases/";
}
@Override
public void onCreate(SQLiteDatabase db) {
boolean addb = chechkdb();
if (!addb) {
this.getReadableDatabase();
try {
copyDataBase();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} else {
}
}
private void copyDataBase() throws IOException {
InputStream myInput = ourcontext.getAssets().open(mydb);
String outFileName = path + mydb;
OutputStream myOutput = new FileOutputStream(outFileName);
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();
}
private Boolean chechkdb() {
dbpath = path + mydb;
SQLiteDatabase check = null;
check = SQLiteDatabase.openDatabase(dbpath, null,
SQLiteDatabase.OPEN_READONLY);
if (check != null) {
dbchk = true;
} else {
dbchk = false;
}
return dbchk;
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
public void fetchqan() {
String qu="SELECT QUESTION,ANSWER FROM QNA WHERE QID=1 ";
q.getWritableDatabase();
Cursor c=db1.rawQuery(qu, null);
dispq=c.getString(1);
dispa=c.getString(2);
}
public upper(Context c) {
ourcontext = c;
}
public upper open() {
q = new insertq(ourcontext);
db1 = q.getWritableDatabase();
return this;
}
public void close() {
q.close();
}
}
栈跟踪
Thread [<1> main] (Suspended (exception SQLiteException))
upper$insertq(SQLiteOpenHelper).getWritableDatabase() line: 96
upper.open() line: 112
AptitudeActivity.onClick(View) line: 41
Button(View).performClick() line: 2485
View$PerformClick.run() line: 9080
ViewRoot(Handler).handleCallback(Message) line: 587
ViewRoot(Handler).dispatchMessage(Message) line: 92
Looper.loop() line: 123
ActivityThread.main(String[]) line: 3683
Method.invokeNative(Object, Object[], Class, Class[], Class, int, boolean) line: not available [native method]
Method.invoke(Object, Object...) line: 507
ZygoteInit$MethodAndArgsCaller.run() line: 839
ZygoteInit.main(String[]) line: 597
NativeStart.main(String[]) line: not available [native method]