编辑：应用程序在 Android版本2.3.5
的手机上崩溃我昨天在Google Play上传了我的第一个应用程序，今天我收到了错误报告：
android.database.sqlite.SQLiteException: unable to open database file
at android.database.sqlite.SQLiteDatabase.dbopen(Native Method)
at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:1956)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:918)
at com.hazcheck.dgl.data.ExternalDBOpenHelper.openDataBase(ExternalDBOpenHelper.java:96)
at com.hazcheck.dgl.SearchActivity.afterTextChanged(SearchActivity.java:284)
at android.widget.TextView.sendAfterTextChanged(TextView.java:6566)
at android.widget.TextView$ChangeWatcher.afterTextChanged(TextView.java:6989)
at android.text.SpannableStringBuilder.sendTextHasChanged(SpannableStringBuilder.java:897)
at android.text.SpannableStringBuilder.change(SpannableStringBuilder.java:353)
at android.text.SpannableStringBuilder.change(SpannableStringBuilder.java:269)
at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:432)
at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:409)
at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:28)
at android.view.inputmethod.BaseInputConnection.replaceText(BaseInputConnection.java:679)
at android.view.inputmethod.BaseInputConnection.commitText(BaseInputConnection.java:185)
at com.android.internal.widget.EditableInputConnection.commitText(EditableInputConnection.java:120)
at com.android.internal.view.IInputConnectionWrapper.executeMessage(IInputConnectionWrapper.java:332)
at com.android.internal.view.IInputConnectionWrapper$MyHandler.handleMessage(IInputConnectionWrapper.java:86)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:143)
at android.app.ActivityThread.main(ActivityThread.java:4268)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
at dalvik.system.NativeStart.main(Native Method)
编辑：这是我的SQLiteOpenHelper类，我可能做错了，请查看：
package com.hazcheck.dgl.data;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
//import java.util.zip.ZipInputStream;
import com.hazcheck.dgl.R;
import android.content.Context;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
//import android.content.res.Resources;
public class ExternalDBOpenHelper extends SQLiteOpenHelper{
//public static int DB_PATH_ID;
public static String DB_NAME;
public static String DB_PATH;
public static int DB_VERSION;
public SQLiteDatabase database;
public final Context context;
//private Resources resources;
public SQLiteDatabase getDb() {
return database;
}
public ExternalDBOpenHelper(Context context) {
super(context, DB_NAME = context.getString(R.string.app_data_name), null, DB_VERSION = Integer.parseInt((context.getString(R.string.app_database_version))));
this.context = context;
String packageName = context.getPackageName();
//resources = context.getResources();
//DB_PATH_ID = R.raw.imdg35;
DB_PATH = String.format("//data//data//%s//databases//", packageName);
openDataBase(); //createDataBase();
}
public void createDataBase() {
boolean dbExist = checkDataBase();
if (!dbExist) {
this.getReadableDatabase();
try {
copyDataBase();
} catch (IOException e) {
Log.e(this.getClass().toString(), "Copying error");
throw new Error("Error copying database!");
}
} else {
Log.i(this.getClass().toString(), "Database already exists");
}
}
private boolean checkDataBase() {
String path = DB_PATH + DB_NAME;
File dbFile = new File(path);
return dbFile.exists();
}
private void copyDataBase() throws IOException {
InputStream externalDbStream = context.getAssets().open(DB_NAME);
String outFileName = DB_PATH + DB_NAME;
OutputStream localDbStream = new FileOutputStream(outFileName);
byte[] buffer = new byte[1024];
int bytesRead;
while ((bytesRead = externalDbStream.read(buffer)) > 0) {
localDbStream.write(buffer, 0, bytesRead);
}
localDbStream.close();
externalDbStream.close();
/* String outFileName = DB_PATH + DB_NAME;
InputStream is = resources.openRawResource(DB_PATH_ID);
OutputStream myOutput = new FileOutputStream(outFileName);
ZipInputStream zis = new ZipInputStream(new BufferedInputStream(is));
try {
while (zis.getNextEntry() != null) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int count;
while ((count = zis.read(buffer)) != -1) {
baos.write(buffer, 0, count);
//Log.d("", buffer.toString());
}
baos.writeTo(myOutput);
}
}
finally{
zis.close();
myOutput.flush();
myOutput.close();
is.close();
}*/
}
public SQLiteDatabase openDataBase() throws SQLException {
String path = DB_PATH + DB_NAME;
if (database == null) {
createDataBase();
database = SQLiteDatabase.openDatabase(path, null, SQLiteDatabase.OPEN_READWRITE);
}
return database;
}
@Override
public synchronized void close() {
if (database != null) {
database.close();
}
super.close();
}
@Override
public void onCreate(SQLiteDatabase db) {}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {}
}
答案 0 :(得分：0)
1）您在此行中指的是哪个数据库：com.hazcheck.dgl.SearchActivity.afterTextChanged(SearchActivity.java:284)？相应的数据库是否存在？您是否在OnCreate（）方法中实例化/创建了数据库？如果没有，那就是你的错误。您可能已经在您的设备上测试了该应用，您只是第一次创建它;即使您更换应用程序包，应用程序也会重新使用数据库。
2）关于“1错误报告，0安装”，这也发生在我的应用程序中。可能更新安装次数的过程是定期的，而更新错误日志是即时的。
答案 1 :(得分：0)
> String outFileName = DB_PATH + DB_NAME;
这可能是一个问题，具体取决于应用程序是安装在SD卡还是手机内存中。
班级DatabaseContext及其后代（如Activity）有一个方法
File getDatabasePath(String name)
应该为您提供正确的目录。
答案 2 :(得分：0)
我发现问题出在数据库本身，它是用旧的Sqlite版本创建的。现在，我使用了Sqlite 3.7.11并重新创建了数据库，现在它工作得很好。
答案 3 :(得分：0)
在我使用此方法使用databaseInstance打开数据库的情况
private static boolean openDB(String dbPathWithName) {
boolean status = true;
try {
if (databaseInstance == null || !databaseInstance.isOpen()){
databaseInstance = SQLiteDatabase.openDatabase(dbPathWithName, null, SQLiteDatabase.OPEN_READWRITE + SQLiteDatabase.CREATE_IF_NECESSARY);
}
} catch (Exception ex){
status = false;
NGAndroidUtil.logErr("DataHelper", ex.getMessage(), ex);
}
return status;
}
在此抛出异常“无法打开数据库”....在这里我没有给出正确格式的数据库路径，这就是为什么它抛出异常“无法打开数据库...确保您要打开的格式正确的数据库路径..