回答你的问题的第一部分,在Android中,我们通常使用SQLite,并且在互联网上有很多例子,例如this之一。我特别不喜欢大多数的在线的例子,但一的基础基本上是:
public class DataBaseHelper extends SQLiteOpenHelper {
private static String DB_PATH = "/data/data/com.your.application/databases/";
private static String DB_NAME = "android.db";
private SQLiteDatabase myDataBase;
private final Context myContext;
/**
* Constructor Takes and keeps a reference of the passed context in order to
* access to the application assets and resources.
*
* @param context
*/
public DataBaseHelper(Context context) {
super(context, DB_NAME, null, 1);
this.myContext = context;
}
/**
* Creates a empty database on the system and rewrites it with your own
* database.
*/
public void createDataBase() throws IOException {
boolean dbExist = checkDataBase();
if (dbExist) {
// do nothing - database already exist
Log.v("Database","Database Exists");
} else {
Log.v("Database","Data base needs creating");
// By calling this method and empty database will be created into
// the default system path
// of your application so we are gonna be able to overwrite that
// database with our database.
this.getReadableDatabase();
try {
Log.v("Database","CopyDataBase");
copyDataBase();
} catch (IOException e) {
throw new Error("Error Copying Database");
}
}
}
/**
* Check if the database already exist to avoid re-copying the file each
* time you open the application.
*
* @return true if it exists, false if it doesn't
*/
private boolean checkDataBase() {
SQLiteDatabase checkDB = null;
try {
String myPath = DB_PATH + DB_NAME;
checkDB = SQLiteDatabase.openDatabase(myPath, null,
SQLiteDatabase.OPEN_READWRITE);
} catch (SQLiteException e) {
// database does't exist yet.
}
if (checkDB != null) {
checkDB.close();
}
return checkDB != null ? true : false;
}
/**
* Copies your database from your local assets-folder to the just created
* empty database in the system folder, from where it can be accessed and
* handled. This is done by transfering bytestream.
*/
private void copyDataBase() throws IOException {
// Open your local db as the input stream
InputStream myInput = myContext.getAssets().open(DB_NAME);
// Path to the just created empty db
String outFileName = DB_PATH + DB_NAME;
// Open the empty db as the output stream
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();
Log.v("Log","Database copied sucsessfully");
}
public void openDataBase() throws SQLException {
// Open the database
String myPath = DB_PATH + DB_NAME;
myDataBase = SQLiteDatabase.openDatabase(myPath, null,SQLiteDatabase.OPEN_READWRITE);
Log.v("Logger","Database Opened");
}
@Override
public synchronized void close() {
if (myDataBase != null)
myDataBase.close();
super.close();
}
@Override
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
public Cursor get() {
return myDataBase.query("AwayMessages", null, null, null, null, null,null);
}
public SQLiteDatabase returnDatabase() {
return myDataBase;
}
}
随着该SQLite数据库将时间提前准备,前启动应用程序,并保存在假设资产文件夹
至于GPS,尝试here
然后,启动摄像头和得到的图片回来到应用程序中,检查出this question
您将需要使用GPS和内置数字罗盘+加速度计。 –
感谢您的信息 - 但问题是 - 我怎样才能创建一个GPS,让我们说一个小按钮,当我点击那个按钮时,GPS将定位我当前的位置/区域? 我怎么能在android中做到这一点?你能举个例子吗? – theBorneo