Android的认为我不关闭我的数据库！为什么？ [英] Android thinks I'm not closing my database! Why?
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问题描述
我有我的onCreate初始化和调用的onPause .close（）上（）一个SQLiteDatabase数据成员的onStop（）和的onDestroy（）。在onResume它重新初始化（）。它似乎运行得很好，但是当我看了看它的调试器看到这一点：
I have a SQLiteDatabase data member that I initialize in onCreate and call .close() on in onPause(), onStop(), and onDestroy(). It is re-initialized in onResume(). It seems to run just fine but when I looked at the debugger it see this:
08-24 20:23:50.014: ERROR/Database(6767): Leak found
08-24 20:23:50.014: ERROR/Database(6767): java.lang.IllegalStateException: /data/data/com.hh.Timepunch/databases/times_database.db SQLiteDatabase created and never closed
08-24 20:23:50.014: ERROR/Database(6767): at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:1695)
08-24 20:23:50.014: ERROR/Database(6767): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:739)
08-24 20:23:50.014: ERROR/Database(6767): at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:761)
08-24 20:23:50.014: ERROR/Database(6767): at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:754)
08-24 20:23:50.014: ERROR/Database(6767): at android.app.ApplicationContext.openOrCreateDatabase(ApplicationContext.java:476)
08-24 20:23:50.014: ERROR/Database(6767): at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:193)
08-24 20:23:50.014: ERROR/Database(6767): at com.hh.Timepunch.TimeSheetActivity.onCreate(TimeSheetActivity.java:72)
08-24 20:23:50.014: ERROR/Database(6767): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
08-24 20:23:50.014: ERROR/Database(6767): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459)
08-24 20:23:50.014: ERROR/Database(6767): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512)
08-24 20:23:50.014: ERROR/Database(6767): at android.app.ActivityThread.access$2200(ActivityThread.java:119)
08-24 20:23:50.014: ERROR/Database(6767): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
08-24 20:23:50.014: ERROR/Database(6767): at android.os.Handler.dispatchMessage(Handler.java:99)
08-24 20:23:50.014: ERROR/Database(6767): at android.os.Looper.loop(Looper.java:123)
08-24 20:23:50.014: ERROR/Database(6767): at android.app.ActivityThread.main(ActivityThread.java:4363)
08-24 20:23:50.014: ERROR/Database(6767): at java.lang.reflect.Method.invokeNative(Native Method)
08-24 20:23:50.014: ERROR/Database(6767): at java.lang.reflect.Method.invoke(Method.java:521)
08-24 20:23:50.014: ERROR/Database(6767): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
08-24 20:23:50.014: ERROR/Database(6767): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
08-24 20:23:50.014: ERROR/Database(6767): at dalvik.system.NativeStart.main(Native Method)
08-24 20:23:50.054: ERROR/Database(6767): Leak found
08-24 20:23:50.054: ERROR/Database(6767): java.lang.IllegalStateException: /data/data/com.hh.Timepunch/databases/times_database.db SQLiteDatabase created and never closed
08-24 20:23:50.054: ERROR/Database(6767): at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:1695)
08-24 20:23:50.054: ERROR/Database(6767): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:739)
08-24 20:23:50.054: ERROR/Database(6767): at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:761)
08-24 20:23:50.054: ERROR/Database(6767): at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:754)
08-24 20:23:50.054: ERROR/Database(6767): at android.app.ApplicationContext.openOrCreateDatabase(ApplicationContext.java:476)
08-24 20:23:50.054: ERROR/Database(6767): at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:193)
08-24 20:23:50.054: ERROR/Database(6767): at com.hh.Timepunch.TimepunchActivity.onCreate(TimepunchActivity.java:60)
08-24 20:23:50.054: ERROR/Database(6767): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
08-24 20:23:50.054: ERROR/Database(6767): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459)
08-24 20:23:50.054: ERROR/Database(6767): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512)
08-24 20:23:50.054: ERROR/Database(6767): at android.app.ActivityThread.access$2200(ActivityThread.java:119)
08-24 20:23:50.054: ERROR/Database(6767): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
08-24 20:23:50.054: ERROR/Database(6767): at android.os.Handler.dispatchMessage(Handler.java:99)
08-24 20:23:50.054: ERROR/Database(6767): at android.os.Looper.loop(Looper.java:123)
08-24 20:23:50.054: ERROR/Database(6767): at android.app.ActivityThread.main(ActivityThread.java:4363)
08-24 20:23:50.054: ERROR/Database(6767): at java.lang.reflect.Method.invokeNative(Native Method)
08-24 20:23:50.054: ERROR/Database(6767): at java.lang.reflect.Method.invoke(Method.java:521)
08-24 20:23:50.054: ERROR/Database(6767): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
08-24 20:23:50.054: ERROR/Database(6767): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
08-24 20:23:50.054: ERROR/Database(6767): at dalvik.system.NativeStart.main(Native Method)
08-24 20:23:50.199: ERROR/libs3c2drender(1912): int S3c2DRender::DoG2D(unsigned int, s3c_img*, s3c_rect*, unsigned int, s3c_img*, s3c_rect*, int, int)::S3C_G2D_ROTATOR_18176 fail
在一个地方，我得到这个错误会从这项活动离开时是：
One of the places I get this error is when going away from this activity:
public class TimepunchActivity extends Activity {
Calendar timeNow = Calendar.getInstance();
SQLiteDatabase timesDatabase;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.timepunch);
//Create/open and configure database (if necessary)
timesDatabase = openOrCreateDatabase(
"times_database.db",
SQLiteDatabase.CREATE_IF_NECESSARY,
null);
timesDatabase.setLocale(Locale.getDefault());
timesDatabase.setLockingEnabled(false);
timesDatabase.setVersion(3);
//lenient is set to true so incrementing minute 59 auto increments hour, etc
timeNow.setLenient(true);
//Create table (if necessary)
final String dbCommand = "CREATE TABLE IF NOT EXISTS Timepunches (punch INTEGER PRIMARY KEY);";
timesDatabase.execSQL(dbCommand);
updateLastInPunch();
Button punchButton = (Button)findViewById(R.id.punch_button);
punchButton.setHapticFeedbackEnabled(true);
punchButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
//Insert data
ContentValues punchValue = new ContentValues();
punchValue.put("punch", timeNow.getTimeInMillis());
long newPunchID = timesDatabase.insert("Timepunches", null, punchValue);
punchValue.clear();
//if punch already exists
if (newPunchID < 0) {
AlertDialog.Builder builder = new AlertDialog.Builder(TimepunchActivity.this);
builder.setTitle("Whoops")
.setMessage("I've already recorded a punch for this time and day.")
.setCancelable(true)
.setNeutralButton("Oh", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
})
.show();
}
else {
}
} //end setOnClick()
}); //end click listener for punchButton
} //end onCreate()
@Override
public void onResume() {
super.onResume();
checkFirstTimer();
//Open and configure database
timesDatabase = openOrCreateDatabase(
"times_database.db",
SQLiteDatabase.CREATE_IF_NECESSARY,
null);
timesDatabase.setLocale(Locale.getDefault());
timesDatabase.setLockingEnabled(false);
timesDatabase.setVersion(3);
//Update date object for current time
timeNow.setTimeInMillis(System.currentTimeMillis());
timeNow.set(Calendar.SECOND, 0);
timeNow.set(Calendar.MILLISECOND, 0);
updateClock((TextView)findViewById(R.id.current_time_textbox), timeNow);
updateLastInPunch();
} //end onResume()
@Override
public void onPause() {
super.onPause();
timesDatabase.close();
} //end onResume()
@Override
public void onStop() {
super.onStop();
timesDatabase.close();
} //end onResume()
@Override
public void onDestroy() {
super.onDestroy();
timesDatabase.close();
} //end onResume()
//Shows last in-punch that has no out-punch
// if there is none it hides the section
public void updateLastInPunch() {
Cursor punchCursor = timesDatabase.query("Timepunches", null, null, null, null, null, "punch ASC;");
TextView inPunchLabel = (TextView)findViewById(R.id.in_punch_label_textview);
TextView inPunchTV = (TextView)findViewById(R.id.in_punch_time_textview);
//odd count means there is a missing punch (assumed to be latest in punch)
// therefore show last in punch
if ((punchCursor.getCount()%2) != 0) {
punchCursor.moveToLast();
Calendar lastIn = Calendar.getInstance();
lastIn.setTimeInMillis(punchCursor.getLong(0));
updateClock((TextView)findViewById(R.id.in_punch_time_textview), lastIn);
inPunchLabel.setVisibility(View.VISIBLE);
inPunchLabel.setAnimation(fadeInAnimation);
inPunchLabel.startAnimation(fadeInAnimation);
inPunchTV.setVisibility(View.VISIBLE);
inPunchTV.setAnimation(fadeInAnimation);
inPunchTV.startAnimation(fadeInAnimation);
}
else {
//only fade when "turning off" last punch display
// (don't fade away when returning to screen)
if (inPunchLabel.getVisibility() == View.VISIBLE) {
inPunchLabel.setAnimation(fadeOutAnimation);
inPunchLabel.startAnimation(fadeOutAnimation);
inPunchLabel.setVisibility(View.INVISIBLE);
inPunchTV.setAnimation(fadeOutAnimation);
inPunchTV.startAnimation(fadeOutAnimation);
inPunchTV.setVisibility(View.INVISIBLE);
}
}
punchCursor.close();
} //end getLastInPunch()
} //end TimepunchActivity
奇怪的是，虽然是这个错误是不持久的。
The odd thing is, though, is that this error isn't persistent.
我必须做更多的则调用.close（）？
Do I have to do more then call .close()?
推荐答案
的问题是，你正在创建/两的onCreate然后onResume打开它，让你这样做两次。同样的，你收了两次，所以它会presumably崩溃。
The problem is that you're creating/opening it in both onCreate and then onResume, so you're doing it twice. Likewise, you're closing it twice, so it'll presumably crash.
在一般 - 你为什么不使用 SQLiteOpenHelper ？这将使管理数据库轻松了许多。
In general - why don't you use SQLiteOpenHelper? This will make managing your database a lot easier.
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