我目前正在使用内部SQLite API在我的应用程序中存储数据。基本上它只是一个IP，端口和密码列表。我在GetTerrariumList函数中得到随机异常，主要是data.set*方法。大部分时间都发生在SetAdress和SetPassword。
Database.java
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import java.util.ArrayList;
public class Database extends SQLiteOpenHelper {
private static final int currentVersion = 1;
private static final String databaseName = "MyHedgehogDB";
private static final String ipListTable = "IPListTable";
private static final String ipListTableID = "id";
private static final String ipListTableAdress = "adress";
private static final String ipListTablePort = "port";
private static final String ipListTablePassword = "password";
public Database(Context context) {
super(context, databaseName, null, currentVersion);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE " + ipListTable + " (" + ipListTableID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
+ ipListTableAdress + " VARCHAR, "
+ ipListTablePort + " INTEGER, "
+ ipListTablePassword + " VARCHAR)");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + ipListTable);
onCreate(db);
}
public ArrayList<TerrariumData> GetTerrariumList() {
ArrayList<TerrariumData> result = new ArrayList<>();
SQLiteDatabase db = this.getReadableDatabase();
Cursor res = db.rawQuery("SELECT " + ipListTableID + ", "
+ ipListTableAdress + ", "
+ ipListTablePort + ", "
+ ipListTablePassword
+ " FROM " + ipListTable, null);
res.moveToFirst();
while (res.isAfterLast() == false) {
TerrariumData data = new TerrariumData();
// ERROR OCCURS IN THE FOLLOWING LINES
data.setID(res.getInt(res.getColumnIndex(ipListTableID)));
data.setAdress(res.getString(res.getColumnIndex(ipListTableAdress)));
data.setPort(res.getInt(res.getColumnIndex(ipListTablePort)));
String temp = res.getString(res.getColumnIndex(ipListTablePassword));
data.setPassword(res.getString(res.getColumnIndex(ipListTablePassword)));
result.add(data);
res.moveToNext();
}
return result;
}
public int AddTerrarium(String adress, int Port, String password) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(ipListTableAdress, adress);
contentValues.put(ipListTablePort, Port);
contentValues.put(ipListTablePassword, password);
return (int)db.insert(ipListTable, null, contentValues);
}
public void DeleteTerrarium(int id) {
SQLiteDatabase db = this.getWritableDatabase();
db.delete(ipListTable, "id = ?", new String[] {Integer.toString(id)});
}
}
TerrariumData.java （只是变量的getter和setter）
package net.dev_shack.myhedgehog;
public class TerrariumData {
private int ID = -1;
private String Name = "Unnamed";
private String Adress = "localhost";
private String Password = "";
private int Port = 12312;
private int NumSensors = 0;
private int LightR = 0;
private int LightG = 0;
private int LightB = 0;
private boolean LightStatus = false;
private double Temperature = 0.0;
private boolean HeatLamp = false;
public boolean isError() {
return Error;
}
public void setError(boolean error) {
Error = error;
}
private boolean Error = false;
public boolean isSensorsOK() {
return SensorsOK;
}
public void setSensorsOK(boolean sensorsOK) {
SensorsOK = sensorsOK;
}
private boolean SensorsOK = false;
public boolean isHeatLamp() {
return HeatLamp;
}
public void setHeatLamp(boolean heatLamp) {
HeatLamp = heatLamp;
}
public boolean isLightStatus() {
return LightStatus;
}
public void setLightStatus(boolean lightStatus) {
LightStatus = lightStatus;
}
public boolean isDataValid() {
return DataValid;
}
public void setDataValid(boolean dataValid) {
DataValid = dataValid;
}
private boolean DataValid = false;
public int getNumSensors() {
return NumSensors;
}
public void setNumSensors(int numSensors) {
NumSensors = numSensors;
}
public String getName() {
return Name;
}
public void setName(String name) {
Name = name;
}
public String getAdress() {
return Adress;
}
public void setAdress(String adress) {
Adress = adress;
}
public int getPort() {
return Port;
}
public void setPort(int port) {
Port = port;
}
public int getLightR() {
return LightR;
}
public void setLightR(int lightR) {
LightR = lightR;
}
public int getLightG() {
return LightG;
}
public void setLightG(int lightG) {
LightG = lightG;
}
public int getLightB() {
return LightB;
}
public void setLightB(int lightB) {
LightB = lightB;
}
public double getTemperature() {
return Temperature;
}
public void setTemperature(double temperature) {
Temperature = temperature;
}
public int getID() {
return ID;
}
public void setID(int ID) {
this.ID = ID;
}
public String getPassword() {
return Password;
}
public void setPassword(String password) {
Password = password;
}
}
异常
01-31 13:22:37.825 14028-14028/net.dev_shack.myhedgehog E/art: Throwing OutOfMemoryError "Failed to allocate a 28 byte allocation with 1546896 free bytes and 1510KB until OOM; failed due to fragmentation (required continguous free 4096 bytes for a new buffer where largest contiguous free 0 bytes)" (recursive case)
01-31 13:22:37.825 14028-14038/net.dev_shack.myhedgehog I/art: Alloc partial concurrent mark sweep GC freed 0(0B) AllocSpace objects, 0(0B) LOS objects, 2% free, 62MB/64MB, paused 112us total 38.345ms
01-31 13:22:37.826 14028-14036/net.dev_shack.myhedgehog I/art: WaitForGcToComplete blocked for 86.301ms for cause Alloc
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: "main" prio=5 tid=1 Runnable
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: | group="main" sCount=0 dsCount=0 obj=0x74168000 self=0xb4025800
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: | sysTid=14028 nice=0 cgrp=default sched=0/0 handle=0xb7756ea0
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: | state=R schedstat=( 0 0 0 ) utm=181 stm=6 core=1 HZ=100
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: | stack=0xbf64b000-0xbf64d000 stackSize=8MB
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: | held mutexes= "mutator lock"(shared held)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: native: #00 pc 00005d03 /system/lib/libbacktrace_libc++.so (UnwindCurrent::Unwind(unsigned int, ucontext*)+83)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: native: #01 pc 00003051 /system/lib/libbacktrace_libc++.so (Backtrace::Unwind(unsigned int, ucontext*)+33)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: native: #02 pc 003c9e67 /system/lib/libart.so (art::DumpNativeStack(std::__1::basic_ostream<char, std::__1::char_traits<char> >&, int, char const*, art::mirror::ArtMethod*)+135)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: native: #03 pc 0038f592 /system/lib/libart.so (art::Thread::DumpStack(std::__1::basic_ostream<char, std::__1::char_traits<char> >&) const+290)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: native: #04 pc 00395eab /system/lib/libart.so (art::Thread::ThrowOutOfMemoryError(char const*)+459)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: native: #05 pc 001f1efb /system/lib/libart.so (art::gc::Heap::ThrowOutOfMemoryError(art::Thread*, unsigned int, art::gc::AllocatorType)+1243)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: native: #06 pc 001f5ba5 /system/lib/libart.so (art::gc::Heap::AllocateInternalWithGc(art::Thread*, art::gc::AllocatorType, unsigned int, unsigned int*, unsigned int*, art::mirror::Class**)+2773)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: native: #07 pc 0017e1bb /system/lib/libart.so (art::mirror::Class::AllocObject(art::Thread*)+1275)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: native: #08 pc 003950a4 /system/lib/libart.so (art::Thread::ThrowNewWrappedException(art::ThrowLocation const&, char const*, char const*)+820)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: native: #09 pc 00395f52 /system/lib/libart.so (art::Thread::ThrowOutOfMemoryError(char const*)+626)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: native: #10 pc 001f1efb /system/lib/libart.so (art::gc::Heap::ThrowOutOfMemoryError(art::Thread*, unsigned int, art::gc::AllocatorType)+1243)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: native: #11 pc 001f5ba5 /system/lib/libart.so (art::gc::Heap::AllocateInternalWithGc(art::Thread*, art::gc::AllocatorType, unsigned int, unsigned int*, unsigned int*, art::mirror::Class**)+2773)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: native: #12 pc 0017e1bb /system/lib/libart.so (art::mirror::Class::AllocObject(art::Thread*)+1275)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: native: #13 pc 0031eda9 /system/lib/libart.so (art::mirror::String::Alloc(art::Thread*, int)+937)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: native: #14 pc 0031f66d /system/lib/libart.so (art::mirror::String::AllocFromUtf16(art::Thread*, int, unsigned short const*, int)+45)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: native: #15 pc 002cb79b /system/lib/libart.so (art::JNI::NewString(_JNIEnv*, unsigned short const*, int)+363)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: native: #16 pc 0010ec4d /system/lib/libart.so (art::CheckJNI::NewString(_JNIEnv*, unsigned short const*, int)+125)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: native: #17 pc 000ac99d /system/lib/libandroid_runtime.so (???)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: native: #18 pc 00a27536 /data/dalvik-cache/x86/system@framework@boot.oat (Java_android_database_CursorWindow_nativeGetString__JII+154)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: at android.database.CursorWindow.nativeGetString(Native method)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: at android.database.CursorWindow.getString(CursorWindow.java:438)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:51)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: at net.dev_shack.myhedgehog.Database.GetTerrariumList(Database.java:50)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: at net.dev_shack.myhedgehog.MainActivity.onCreate(MainActivity.java:44)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: at android.app.Activity.performCreate(Activity.java:5990)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: at android.app.ActivityThread.access$800(ActivityThread.java:151)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: at android.os.Handler.dispatchMessage(Handler.java:102)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: at android.os.Looper.loop(Looper.java:135)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: at android.app.ActivityThread.main(ActivityThread.java:5254)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: at java.lang.reflect.Method.invoke!(Native method)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: at java.lang.reflect.Method.invoke(Method.java:372)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
01-31 13:22:37.828 14028-14028/net.dev_shack.myhedgehog E/art: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
01-31 13:22:37.835 14028-14036/net.dev_shack.myhedgehog W/art: Suspending all threads took: 5.871ms
01-31 13:22:37.835 14028-14036/net.dev_shack.myhedgehog I/art: Alloc sticky concurrent mark sweep GC freed 0(0B) AllocSpace objects, 0(0B) LOS objects, 2% free, 62MB/64MB, paused 6.062ms total 9.708ms
01-31 13:22:37.881 14028-14038/net.dev_shack.myhedgehog I/art: Alloc concurrent mark sweep GC freed 1414046(61MB) AllocSpace objects, 0(0B) LOS objects, 50% free, 996KB/2020KB, paused 201us total 45.512ms
01-31 13:22:37.881 14028-14036/net.dev_shack.myhedgehog I/art: WaitForGcToComplete blocked for 39.894ms for cause Alloc
01-31 13:22:37.884 14028-14028/net.dev_shack.myhedgehog I/art: WaitForGcToComplete blocked for 43.182ms for cause Alloc
01-31 13:22:37.884 14028-14028/net.dev_shack.myhedgehog D/AndroidRuntime: Shutting down VM
01-31 13:22:37.885 14028-14028/net.dev_shack.myhedgehog E/AndroidRuntime: FATAL EXCEPTION: main
Process: net.dev_shack.myhedgehog, PID: 14028
java.lang.OutOfMemoryError: OutOfMemoryError thrown while trying to throw OutOfMemoryError; no stack available
01-31 13:22:37.886 14028-14038/net.dev_shack.myhedgehog E/System: java.lang.OutOfMemoryError: OutOfMemoryError thrown while trying to throw OutOfMemoryError; no stack available
01-31 13:22:37.886 14028-14036/net.dev_shack.myhedgehog W/System.err: java.lang.OutOfMemoryError: OutOfMemoryError thrown while trying to throw OutOfMemoryError; no stack available
答案 0 :(得分：2)
您不会向前移动res，因此您的while循环将执行并反复添加相同的元素，直到内存耗尽。
答案 1 :(得分：0)
在while循环结束时，请尝试res.moveToNext();