我有几种不同的手机，我认为这种导入对它们都适用，除了我的Huawei Mate 20 Pro。这是代码-
public static void importDB() {
Log.i("ImportDB", "Started");
try {
String DB_PATH = "/data/data/com.androidandyuk.autobuddy/databases/Vehicles";
File sdcard = Environment.getExternalStorageDirectory();
String yourDbFileNamePresentInSDCard = sdcard.getAbsolutePath() + File.separator + "AutoBuddy/Vehicles.db";
Log.i("ImportDB", "SDCard File " + yourDbFileNamePresentInSDCard);
File file = new File(yourDbFileNamePresentInSDCard);
// Open your local db as the input stream
InputStream myInput = new FileInputStream(file);
// Path to created empty db
String outFileName = DB_PATH;
// Opened assets database structure
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();
} catch (Exception e) {
Log.i("ImportDB", "Exception Caught" + e);
}
loadBikes();
Fuelling.loadFuels();
Maintenance.loadLogs();
ToDo.loadToDos();
Context context = App.getContext();
Toast.makeText(context, "Data Imported. Close app and reopen", Toast.LENGTH_LONG).show();
if (bikes.size() > 0) {
activeBike = 0;
}
}
public void importDB2() {
Uri selectedUri = Uri.parse(Environment.getExternalStorageDirectory().getPath() + "/AutoBuddy/");
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
// intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setDataAndType(selectedUri, "*/*");
Intent i = Intent.createChooser(intent, "File");
startActivityForResult(i, CHOOSE_FILE_REQUESTCODE);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch(requestCode){
case CHOOSE_FILE_REQUESTCODE:
if(resultCode==-1){
Uri uri = data.getData();
String yourDbFileNamePresentInSDCard = uri.getPath();
//int index = yourDbFileNamePresentInSDCard.indexOf(":");
//if(index > 0) {
// yourDbFileNamePresentInSDCard = yourDbFileNamePresentInSDCard.substring(index+1);
//}
Log.i("ImportDB", "Started");
try {
String DB_PATH = "/data/data/com.androidandyuk.autobuddy/databases/sessions";
// File sdcard = Environment.getExternalStorageDirectory();
// yourDbFileNamePresentInSDCard = sdcard.getAbsolutePath() + File.separator + "LapTimerBuddy/LapTimer.db";
Log.i("ImportDB", "SDCard File " + yourDbFileNamePresentInSDCard);
File file = new File(yourDbFileNamePresentInSDCard);
// Open your local db as the input stream
InputStream myInput = new FileInputStream(file);
// Path to created empty db
String outFileName = DB_PATH;
// Opened assets database structure
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();
} catch (Exception e) {
Log.i("ImportDB", "Exception Caught" + e);
}
loadBikes();
Fuelling.loadFuels();
Maintenance.loadLogs();
ToDo.loadToDos();
Context context = App.getContext();
Toast.makeText(context, "Data Imported. Close app and reopen", Toast.LENGTH_LONG).show();
if (bikes.size() > 0) {
activeBike = 0;
}
}
break;
}
super.onActivityResult(requestCode, resultCode, data);
}
在MainActivity中，实际负载为-
public static void loadBikes() {
Log.i("Main Activity", "New Bikes Loading");
int bikesSize = sharedPreferences.getInt("bikesSize", 0);
Log.i("Bikes Size", "" + bikesSize);
bikes.clear();
try {
Cursor c = vehiclesDB.rawQuery("SELECT * FROM vehicles", null);
int makeIndex = c.getColumnIndex("make");
int modelIndex = c.getColumnIndex("model");
int regIndex = c.getColumnIndex("reg");
int bikeIdIndex = c.getColumnIndex("bikeId");
int VINIndex = c.getColumnIndex("VIN");
int serviceDueIndex = c.getColumnIndex("serviceDue");
int MOTdueIndex = c.getColumnIndex("MOTdue");
int lastKnownServiceIndex = c.getColumnIndex("lastKnownService");
int lastKnownMOTIndex = c.getColumnIndex("lastKnownMOT");
int yearOfManIndex = c.getColumnIndex("yearOfMan");
int notesIndex = c.getColumnIndex("notes");
int estMileageIndex = c.getColumnIndex("estMileage");
int MOTwarnedIndex = c.getColumnIndex("MOTwarned");
int serviceWarnedIndex = c.getColumnIndex("serviceWarned");
int taxDueIndex = c.getColumnIndex("taxDue");
c.moveToFirst();
do {
ArrayList<String> make = new ArrayList<>();
ArrayList<String> model = new ArrayList<>();
ArrayList<String> reg = new ArrayList<>();
ArrayList<String> bikeId = new ArrayList<>();
ArrayList<String> VIN = new ArrayList<>();
ArrayList<String> serviceDue = new ArrayList<>();
ArrayList<String> MOTdue = new ArrayList<>();
ArrayList<String> lastKnownService = new ArrayList<>();
ArrayList<String> lastKnownMOT = new ArrayList<>();
ArrayList<String> yearOfMan = new ArrayList<>();
ArrayList<String> notes = new ArrayList<>();
ArrayList<String> estMileage = new ArrayList<>();
ArrayList<String> MOTwarned = new ArrayList<>();
ArrayList<String> serviceWarned = new ArrayList<>();
ArrayList<String> taxDue = new ArrayList<>();
try {
make = (ArrayList<String>) ObjectSerializer.deserialize(c.getString(makeIndex));
model = (ArrayList<String>) ObjectSerializer.deserialize(c.getString(modelIndex));
reg = (ArrayList<String>) ObjectSerializer.deserialize(c.getString(regIndex));
bikeId = (ArrayList<String>) ObjectSerializer.deserialize(c.getString(bikeIdIndex));
VIN = (ArrayList<String>) ObjectSerializer.deserialize(c.getString(VINIndex));
serviceDue = (ArrayList<String>) ObjectSerializer.deserialize(c.getString(serviceDueIndex));
MOTdue = (ArrayList<String>) ObjectSerializer.deserialize(c.getString(MOTdueIndex));
lastKnownService = (ArrayList<String>) ObjectSerializer.deserialize(c.getString(lastKnownServiceIndex));
lastKnownMOT = (ArrayList<String>) ObjectSerializer.deserialize(c.getString(lastKnownMOTIndex));
yearOfMan = (ArrayList<String>) ObjectSerializer.deserialize(c.getString(yearOfManIndex));
notes = (ArrayList<String>) ObjectSerializer.deserialize(c.getString(notesIndex));
estMileage = (ArrayList<String>) ObjectSerializer.deserialize(c.getString(estMileageIndex));
MOTwarned = (ArrayList<String>) ObjectSerializer.deserialize(c.getString(MOTwarnedIndex));
serviceWarned = (ArrayList<String>) ObjectSerializer.deserialize(c.getString(serviceWarnedIndex));
taxDue = (ArrayList<String>) ObjectSerializer.deserialize(c.getString(taxDueIndex));
Log.i("Bikes Restored ", "Count :" + make.size());
} catch (Exception e) {
e.printStackTrace();
Log.i("Loading Bikes", "Failed attempt");
}
Log.i("Retrieved info", "Log count :" + make.size());
if (make.size() > 0 && model.size() > 0 && bikeId.size() > 0) {
// we've checked there is some info
if (make.size() == model.size() && model.size() == bikeId.size()) {
// we've checked each item has the same amount of info, nothing is missing
for (int x = 0; x < make.size(); x++) {
int thisId = Integer.parseInt(bikeId.get(x));
double thisEstMileage = Double.parseDouble(estMileage.get(x));
boolean thisMOTwarned = Boolean.parseBoolean(MOTwarned.get(x));
boolean thisServiceWarned = Boolean.parseBoolean(serviceWarned.get(x));
Bike newBike = new Bike(thisId, make.get(x), model.get(x), reg.get(x), VIN.get(x), serviceDue.get(x), MOTdue.get(x), lastKnownService.get(x), lastKnownMOT.get(x),
yearOfMan.get(x), notes.get(x), thisEstMileage, thisMOTwarned, thisServiceWarned, taxDue.get(x));
Log.i("Adding", " " + x + " " + newBike);
bikes.add(newBike);
}
}
}
} while (c.moveToNext());
} catch (Exception e) {
Log.i("LoadingDB", "Caught Error");
e.printStackTrace();
}
Bike.bikeCount = sharedPreferences.getInt("bikeCount", 0);
loadLogs();
loadFuels();
}
在华为上运行该命令时得到的日志是-
2018-11-22 09:43:07.358 13024-13024/com.androidandyuk.autobuddy I/ViewRootImpl: jank_removeInvalidNode all the node in jank list is out of time
2018-11-22 09:43:07.362 13024-13024/com.androidandyuk.autobuddy V/AudioManager: playSoundEffect effectType: 0
2018-11-22 09:43:07.362 13024-13024/com.androidandyuk.autobuddy V/AudioManager: querySoundEffectsEnabled...
2018-11-22 09:43:07.363 13024-13024/com.androidandyuk.autobuddy I/ImportDB: Started
2018-11-22 09:43:07.364 13024-13024/com.androidandyuk.autobuddy I/ImportDB: SDCard File /storage/emulated/0/AutoBuddy/Vehicles.db
2018-11-22 09:43:07.366 13024-13024/com.androidandyuk.autobuddy I/Main Activity: New Bikes Loading
2018-11-22 09:43:07.366 13024-13024/com.androidandyuk.autobuddy I/Bikes Size: 0
2018-11-22 09:43:07.378 13024-13024/com.androidandyuk.autobuddy I/Bikes Restored: Count :0
2018-11-22 09:43:07.378 13024-13024/com.androidandyuk.autobuddy I/Retrieved info: Log count :0
2018-11-22 09:43:07.397 13024-13024/com.androidandyuk.autobuddy D/HwAppInnerBoostImpl: asyncReportData com.androidandyuk.autobuddy,2,1,1,0 interval=159
2018-11-22 09:43:07.469 13024-13024/com.androidandyuk.autobuddy D/HwAppInnerBoostImpl: asyncReportData com.androidandyuk.autobuddy,2,2,1,6 interval=231
2018-11-22 09:43:07.472 13024-13089/com.androidandyuk.autobuddy D/OpenGLRenderer: HWUI Binary is enabled
--------- beginning of system
2018-11-22 09:43:07.485 13024-13089/com.androidandyuk.autobuddy D/mali_winsys: EGLint new_window_surface(egl_winsys_display *, void *, EGLSurface, EGLConfig, egl_winsys_surface **, EGLBoolean) returns 0x3000
2018-11-22 09:43:07.485 13024-13089/com.androidandyuk.autobuddy D/OpenGLRenderer: HWUI Binary is enabled
2018-11-22 09:43:07.654 13024-13024/com.androidandyuk.autobuddy D/HwAppInnerBoostImpl: asyncReportData com.androidandyuk.autobuddy,2,1,2,0 interval=416
2018-11-22 09:43:10.914 13024-13089/com.androidandyuk.autobuddy W/libEGL: EGLNativeWindowType 0x76f41cf010 disconnect failed
2018-11-22 09:43:10.928 1235-2380/? W/NotificationService: Toast already killed. pkg=com.androidandyuk.autobuddy callback=android.app.ITransientNotification$Stub$Proxy@2031e32
2018-11-22 09:43:15.404 1235-1659/? D/hw_netstat: total/5999/1982,com.google.android.keep/1891/1686,com.google.uid.shared:10015/2250/52,unknown:0/1570/0,com.android.vending/208/192,com.androidandyuk.autobuddy/80/52
2018-11-22 09:43:30.423 1235-1659/? D/hw_netstat: total/3866/1426,unknown:0/2252/80,com.google.uid.shared:10015/999/413,com.whatsapp/40/457,unknown:1051/341/67,com.huawei.appmarket/182/222,com.teslacoilsw.launcher/0/135,com.androidandyuk.autobuddy/52/52
我以为华为可能有一个奇怪的文件结构，但是找不到文件没有错误，只是没有像其他人一样从文件中读取信息。
如果这很重要，则该设备是运行Android 9.0的Huawei Mate 20 Pro。
有什么想法吗？
**编辑**如果我使用华为手机，请在应用程序中进行一些设置，然后将其保存到数据库中，这样才能将其导出（我很陌生，这似乎很容易让我导出和导入的方式），然后我导出并尝试在Android One设备上将其导入，这不起作用。
实际上，我已经上载了导出的数据库，它看上去很空。这使我相信问题出在华为使用不同的内部存储，而问题可能在于它从未在本地保存数据库，因此无法导出数据库。
EDIT2 在内部读取和写入数据库时一切正常。我如何检查此行是否正确-
String DB_PATH = "/data/data/com.androidandyuk.autobuddy/databases/Vehicles";
如果我没有根？我可以使用ADB监听并检查华为存储应用程序数据的位置吗？
答案 0 :(得分：2)
EDIT2读取和写入内容时一切正常 内部数据库。我如何检查此行是否正确-
String DB_PATH = "/data/data/com.androidandyuk.autobuddy/databases/Vehicles";
不要，请使用the_context.getDatabasePath("Vehicles").getPath();，其中 the_context 是上下文。
另外，如果存在或没有其他数据库，而您只是在检查数据库文件是否存在，则 databases文件夹将不存在。因此，建议通过检查路径的父级以查看 databases 目录是否存在，以及是否不使用 mkdirs 创建目录来检查该目录是否存在。 ）。
以下是同时使用上述内容的摘录
mDBPath = context.getDatabasePath(database).getPath();
if (!ifDatabaseExists(mDBPath)) {
...... copy the db from the assets folder
}
private boolean ifDatabaseExists(String dbpath) {
File db = new File(dbpath);
if(db.exists()) return true;
File dir = new File(db.getParent());
if (!dir.exists()) {
dir.mkdirs();
}
return false;
}