我将从数据库中显示获取spinner thats项目，我不知道为什么无法找到数据库
这是我的databaseopenhelper
public class DtabaseOpenHelper_loghat extends SQLiteOpenHelper {
private static String DB_NAME = "my_db_vokabel";
private static String DB_PATH = "";
private static int DB_VERSION = 1;
private SQLiteDatabase mydatabase;
private Context mycontext;
public DtabaseOpenHelper_loghat(Context context) {
super(context, DB_NAME, null, DB_VERSION);
if (Build.VERSION.SDK_INT >= 15) {
DB_PATH = context.getApplicationInfo().dataDir + "/database/";
} else {
DB_PATH = Environment.getDataDirectory() + "/data/" + context.getPackageName() + "/data/";
}
this.mycontext = context;
}
@Override
public void onCreate(SQLiteDatabase sqLiteDatabase) {
}
@Override
public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {
}
public void checkandcopy_database() {
boolean dbExist = check_database();
if (dbExist) {
Log.d("TAG", "database already exist");
} else {
this.getReadableDatabase();
}
try {
copydatabase();
} catch (IOException e) {
e.printStackTrace();
Log.d("TAG", "database already exist");
}
}
public boolean check_database() {
SQLiteDatabase checkDB = null;
try {
String mypath = DB_PATH + DB_NAME;
checkDB = SQLiteDatabase.openDatabase(mypath, null, OPEN_READWRITE);
} catch (SQLException e) {
}
if (checkDB != null) {
checkDB.close();
}
return
checkDB != null ? true : false;
}
private void copydatabase() throws IOException {
InputStream myinputstream = mycontext.getAssets().open(DB_NAME);
String outfilename = DB_PATH + DB_NAME;
OutputStream myoutput = new FileOutputStream(outfilename);
byte[] buffer = new byte[1024];
int lenght;
while ((lenght = myinputstream.read(buffer)) > 0) {
myoutput.write(buffer, 0, lenght);
}
myoutput.flush();
myoutput.close();
myinputstream.close();
}
public void openDatabe() {
String mypath = DB_PATH + DB_NAME;
mydatabase = SQLiteDatabase.openDatabase(mypath, null, OPEN_READWRITE);
}
public synchronized void close() {
if (mydatabase != null) {
mydatabase.close();
}
super.close();
}
public Cursor querydata(String query) {
return mydatabase.rawQuery(query, null);
}
// baraye khandane fallen az database baraye spinner //
public List<String> getAllLabels() {
List<String> items = new ArrayList<>();
// Select All Query
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery("select * from fallen", null);
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
items.add(cursor.getString(1));
} while (cursor.moveToNext());
}
// closing connection
cursor.close();
db.close();
// returning lables
return items;
}
}
这是我的帖子
public class Post {
private Drawable fav_icone;
private String loghat;
private String artikel;
private String bedeutung;
private String mesal;
public Drawable getFav_icone() {
return fav_icone;
}
public void setFav_icone(Drawable fav_icone) {
this.fav_icone = fav_icone;
}
public String getLoghat() {
return loghat;
}
public void setLoghat(String loghat) {
this.loghat = loghat;
}
public String getArtikel() {
return artikel;
}
public void setArtikel(String artikel) {
this.artikel = artikel;
}
public String getBedeutung() {
return bedeutung;
}
public void setBedeutung(String bedeutung) {
this.bedeutung = bedeutung;
}
public String getMesal() {
return mesal;
}
public void setMesal(String mesal) {
this.mesal = mesal;
}
}
这是我在这里的活动，我将从tabel（下降）获取数据并在spinner中显示
public class Add_loghat_activity extends AppCompatActivity implements AdapterView.OnItemSelectedListener {
TextView textview_1;
RadioButton radio_der, radio_die, radio_das;
MaterialBetterSpinner spinn_fallen;
EditText edit_nloghat, edit_bedeut, edit_mesal;
Button btn_back;
Button btn_sabt;
DtabaseOpenHelper_loghat my_db;
ArrayAdapter myAdapter;
SQLiteDatabase db;
Context context;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_loghat_activity);
radio_der = findViewById(R.id.artkel_der);
radio_die = findViewById(R.id.artkel_die);
radio_das = findViewById(R.id.artkel_das);
edit_nloghat = findViewById(R.id.edit_text_loghat);
edit_bedeut = findViewById(R.id.edit_text_bedeutung);
edit_mesal = findViewById(R.id.edit_text_mesal);
spinn_fallen = findViewById(R.id.spinner_fallen);
loadSpinnerData();
// animation for textview in addloghat//
textview_1 = findViewById(R.id.text_view1);
textview_1.setText("کلمه جدید را وارد کنید");
textview_1.setAnimation(AnimationUtils.loadAnimation(Add_loghat_activity.this, android.R.anim.slide_in_left));
//values in spenner for fallen//
//disabel kardane btn sabt//
btn_sabt = findViewById(R.id.btn_sabt);
btn_sabt.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(), "Okay man guuut", Toast.LENGTH_LONG).show();
}
});
//btn back //
btn_back = findViewById(R.id.btn_back);
btn_back.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent int_back = new Intent(Add_loghat_activity.this, My_activity.class);
startActivity(int_back);
}
});
btn_sabt.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
}
});
}
private void loadSpinnerData() {
// database handler
my_db = new DtabaseOpenHelper_loghat(getApplicationContext());
my_db.openDatabe();
// Spinner Drop down elements
List<String> items = my_db.getAllLabels();
// Creating adapter for spinner
myAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_dropdown_item_1line, items);
// Drop down layout style - list view with radio button
myAdapter
.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// attaching data adapter to spinner
spinn_fallen.setAdapter(myAdapter);
}
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
}
这是我的适配器
public class LoghatsAdapter extends RecyclerView.Adapter<LoghatsAdapter.LoghatViewHolder> {
private Context context;
private List<Post> postha = Collections.emptyList();
private Activity activity;
private OnTabListener ontabmylistener;
public LoghatsAdapter(Activity activity, List<Post> postha) {
this.activity = activity;
this.postha = postha;
}
public LoghatsAdapter() {
this.context = context;
this.postha = postha;
}
@Override
public LoghatViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View viewitem = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_loghat, parent, false);
return new LoghatViewHolder(viewitem);
}
@Override
public void onBindViewHolder(LoghatViewHolder holder, @SuppressLint("RecyclerView") final int position) {
holder.loghat.setText(postha.get(position).getLoghat());
holder.artikel.setText(postha.get(position).getArtikel());
holder.bedeutung.setText(postha.get(position).getBedeutung());
holder.mesal.setText(postha.get(position).getMesal());
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (ontabmylistener != null) {
ontabmylistener.OnTabView(position);
}
}
});
}
@Override
public int getItemCount() {
return postha.size();
}
public void setOntabmylistener(OnTabListener ontabmylistener) {
this.ontabmylistener = ontabmylistener;
}
class LoghatViewHolder extends RecyclerView.ViewHolder {
private TextView loghat;
private TextView artikel;
private TextView bedeutung;
private TextView mesal;
private ImageButton img_favorite;
public LoghatViewHolder(View itemView) {
super(itemView);
loghat = (TextView) itemView.findViewById(R.id.textview_loghat);
artikel = (TextView) itemView.findViewById(R.id.textview_artikel);
bedeutung = (TextView) itemView.findViewById(R.id.textview_bedeutung);
mesal = (TextView) itemView.findViewById(R.id.textview_mesal);
img_favorite = (ImageButton) itemView.findViewById(R.id.img_btn_favorite);
}
}
}
这是错误
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.et.vokabelheft_1, PID: 6237
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.et.vokabelheft_1/com.example.et.vokabelheft_1.Activitis.Add_loghat_activity}: android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2778)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
Caused by: android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database
at android.database.sqlite.SQLiteConnection.nativeOpen(Native Method)
at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:210)
at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:194)
at android.database.sqlite.SQLiteConnectionPool.openConnectionLocked(SQLiteConnectionPool.java:493)
at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:200)
at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:192)
at android.database.sqlite.SQLiteDatabase.openInner(SQLiteDatabase.java:864)
at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:849)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:750)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:699)
at com.example.et.vokabelheft_1.DtabaseOpenHelper_loghat.openDatabe(DtabaseOpenHelper_loghat.java:109)
at com.example.et.vokabelheft_1.Activitis.Add_loghat_activity.loadSpinnerData(Add_loghat_activity.java:101)
at com.example.et.vokabelheft_1.Activitis.Add_loghat_activity.onCreate(Add_loghat_activity.java:51)
at android.app.Activity.performCreate(Activity.java:7000)
at android.app.Activity.performCreate(Activity.java:6991)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1214)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2731)