导出button按下后导出的文件在哪里？
我已经尝试在我的sqlite数据库导出function，以导出到excel sheet.but我不知道我的导出function实现成功，如果是的，所以我的导出文件在哪里，如果我的代码包含一些错误好心帮助我becoz我是新的android.this是我的sqlite控制器类是包括出口function： –
public class SQLController { private DBhelper dbhelper; private Context ourcontext; private SQLiteDatabase database; public SQLController(Context c) { ourcontext = c; } public SQLController open() throws SQLException { dbhelper = new DBhelper(ourcontext); database = dbhelper.getWritableDatabase(); return this; } public void close() { dbhelper.close(); } public void insertData(String name) { ContentValues cv = new ContentValues(); cv.put(DBhelper.MEMBER_NAME, name); database.insert(DBhelper.TABLE_MEMBER, null, cv); } public Cursor readData() { String[] allColumns = new String[] { DBhelper.MEMBER_ID, DBhelper.MEMBER_NAME }; Cursor c = database.query(DBhelper.TABLE_MEMBER, allColumns, null, null, null, null, null); if (c != null) { c.moveToFirst(); } return c; } public int updateData(long memberID, String memberName) { ContentValues cvUpdate = new ContentValues(); cvUpdate.put(DBhelper.MEMBER_NAME, memberName); int i = database.update(DBhelper.TABLE_MEMBER, cvUpdate, DBhelper.MEMBER_ID + " = " + memberID, null); return i; } public void deleteData(long memberID) { database.delete(DBhelper.TABLE_MEMBER, DBhelper.MEMBER_ID + "=" + memberID, null); } public void export() throws IOException{ File dbFile=ourcontext.getDatabasePath(dbhelper. DB_NAME); File exportDir = new File(Environment.getExternalStorageDirectory()+"/XLS", ""); if (!exportDir.exists()) { Log.d("export", ""+exportDir); exportDir.mkdirs(); } File file = new File(exportDir, "Your file.xls"); file.createNewFile(); File file8 = null; CSVWriter csvWrite8 = new CSVWriter(new FileWriter(file8)); String[] allColumns = new String[] { DBhelper.MEMBER_ID, DBhelper.MEMBER_NAME }; Cursor c = database.query(DBhelper.TABLE_MEMBER, allColumns, null, null, null, null, null); CSVWriter csvWrite = null; if(c.moveToFirst()) { c.moveToFirst(); Log.d("log is","No of Column is ---->>>"+c.getColumnNames().length); do { String arrStr[] = {c.getString(0),c.getString(1),c.getString(2),c.getString(3),c.getString(4),c.getString(5)}; csvWrite.writeNext(arrStr); }while(c.moveToNext()); } csvWrite.close(); } }// outer class end 这是我的数据库帮助类
public class DBhelper extends SQLiteOpenHelper { // TABLE INFORMATTION public static final String TABLE_MEMBER = "member"; public static final String MEMBER_ID = "_id"; public static final String MEMBER_NAME = "name"; // DATABASE INFORMATION static final String DB_NAME = "MEMBER.DB"; static final int DB_VERSION = 1; // TABLE CREATION STATEMENT private static final String CREATE_TABLE = "create table " + TABLE_MEMBER + "(" + MEMBER_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + MEMBER_NAME + " TEXT NOT NULL);"; public DBhelper(Context context) { super(context, DB_NAME, null,DB_VERSION); } @Override public void onCreate(SQLiteDatabase db) { db.execSQL(CREATE_TABLE); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { // TODO Auto-generated method stub db.execSQL("DROP TABLE IF EXISTS " + TABLE_MEMBER); onCreate(db); }
}
这是我的类，我在调用buttonid情况下的导出function
public class Modify_member extends Activity implements OnClickListener { EditText et; Button edit_bt, delete_bt,bt; long member_id; SQLController dbcon; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.modify_member); dbcon = new SQLController(this); dbcon.open(); et = (EditText) findViewById(R.id.edit_mem_id); edit_bt = (Button) findViewById(R.id.update_bt_id); delete_bt = (Button) findViewById(R.id.delete_bt_id); bt=(Button) findViewById(R.id.ex); Intent i = getIntent(); String memberID = i.getStringExtra("memberID"); String memberName = i.getStringExtra("memberName"); member_id = Long.parseLong(memberID); et.setText(memberName); edit_bt.setOnClickListener(this); delete_bt.setOnClickListener(this); } @Override public void onClick(View v) { // TODO Auto-generated method stub switch (v.getId()) { case R.id.update_bt_id: String memName_upd = et.getText().toString(); dbcon.updateData(member_id, memName_upd); this.returnHome(); break; case R.id.delete_bt_id: dbcon.deleteData(member_id); this.returnHome(); break; case R.id.ex: try { dbcon.export(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } this.returnHome(); break; }} public void returnHome() { Intent home_intent = new Intent(getApplicationContext(), f.class).setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); startActivity(home_intent); }
}
你的代码表明：文件夹是你的“exportDir”，文件名是“Your file.xls”。
尝试寻找你的文件。 但是确保文件实际上是在那之前生成的。