在我的项目中，我从json下载了我项目的所有数据。我将标题和描述下载为文本，并下载我的图标和游戏文件。 我可以下载它们并保存在数据库中并轻松地在listview中显示。 我的问题是关于如何保存我的游戏文件是否可以下载？ 我有两个按钮。首先是用户点击它时下载按钮，它开始下载文件。下载完成后，我的下载按钮消失，我的播放按钮出现。
我想保存这个，当用户第二次运行应用程序时，我保存例如之前下载的第二个位置。我只有我的播放按钮。
我的数据库：
public class DatabaseHandler extends SQLiteOpenHelper {
public SQLiteDatabase sqLiteDatabase;
int tedad;
public DatabaseHandler(Context context) {
super(context, "EmployeeDatabase.db", null, 1);
}
@Override
public void onCreate(SQLiteDatabase db) {
String tableEmp = "create table emp(PersianTitle text,Description text,icon text,downloadlink text,dl integer)";
db.execSQL(tableEmp);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
public void insertData(ArrayList<String> id, ArrayList<String> name, ArrayList<String> salary, ArrayList<String> roms,String
dl) {
int size = id.size();
tedad = size;
sqLiteDatabase = this.getWritableDatabase();
try {
for (int i = 0; i < size; i++) {
ContentValues values = new ContentValues();
values.put("PersianTitle", id.get(i));
values.put("Description", name.get(i));
values.put("icon", salary.get(i));
values.put("downloadlink", roms.get(i));
values.put("dl", "0");
sqLiteDatabase.insert("emp", null, values);
}
} catch (Exception e) {
Log.e("Problem", e + " ");
}
}
public ArrayList<String> Game_Info (int row, int field) {
String fetchdata = "select * from emp";
SQLiteDatabase sqLiteDatabase = this.getReadableDatabase();
ArrayList<String> stringArrayList = new ArrayList<String>();
Cursor cu = sqLiteDatabase.rawQuery(fetchdata, null);
for (int i = 0; i < row + 1; i++) {
cu.moveToPosition(i);
String s = cu.getString(field);
stringArrayList.add(s);
}
return stringArrayList;
}
}
这是我的主要代码：
public class MainActivity2 extends Activity {
Boolean done_game = false;
ProgressDialog progressDialog;
private boolean _init = false;
ListView listView;
DatabaseHandler database;
BaseAdapter adapter;
public String path_image;
JSONObject jsonObject;
Game_Counter_Store Game_Counter_Store;
int game_counter_store;
ArrayList<String> name_array = new ArrayList<String>();
ArrayList<String> des_array = new ArrayList<String>();
ArrayList<String> icon_array = new ArrayList<String>();
ArrayList<String> roms_array = new ArrayList<String>();
ArrayList<String> fav_array = new ArrayList<String>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main2);
init();
System.gc();
File mediaStorageDir = new File(Environment.getExternalStorageDirectory(), "MyDirName");//make a direction
path_image = mediaStorageDir.getAbsolutePath(); // here is tha path
listView = (ListView) findViewById(R.id.listView);
database = new DatabaseHandler(MainActivity2.this);
database.getWritableDatabase();
Game_Counter_Store = new Game_Counter_Store("Games_Number", this); // number of game in first run is 0
game_counter_store = Game_Counter_Store.get_count();
if (game_counter_store == 0) {
Log.i("mhs", "game_counter_store is 0");
DownloadGames();
} else {
Log.i("mhs", "there are some games");
for (int i = 0; i < game_counter_store; i++) {
name_array = database.Game_Info(i, 0);
des_array = database.Game_Info(i, 1);
icon_array = database.Game_Info(i, 2);
roms_array = database.Game_Info(i, 3);
fav_array = database.Game_Info(i, 4);
}
adapter = new MyBaseAdapter(MainActivity2.this, name_array, des_array, icon_array, roms_array,fav_array);
listView.setAdapter(adapter);
}
}
public void DownloadGames() {
//here we download name, des, icon
MakeDocCallBack makeDocCallBack = new MakeDocCallBack() {
@Override
public void onResult(ArrayList<String> res) {
if (res.size() > 0) {
try {
Game_Counter_Store counter_store = new Game_Counter_Store("Games_Number", MainActivity2.this); // get numbrr of games
counter_store.set_count(res.size()); // store the games number
for (int i = 0; i < res.size(); i++) {
jsonObject = new JSONObject(res.get(i)); //get all the jsons
//get all the data to store in database
name_array.add(jsonObject.getString("PersianTitle"));
des_array.add(jsonObject.getString("Description"));
icon_array.add(jsonObject.getString("icon"));
roms_array.add(jsonObject.getString("downloadlink"));
GetFile fd = new GetFile(MainActivity2.this, path_image, getFileName(jsonObject.getString("icon")), jsonObject.getString("icon").toString(), null); // download the image
GetFileCallBack Image_callback = new GetFileCallBack() {
@Override
public void onStart() {
// Toast.makeText(getApplicationContext(),"start",Toast.LENGTH_LONG).show();
}
@Override
public void onProgress(long l, long l1) {
// Toast.makeText(getApplicationContext(),"onProgress",Toast.LENGTH_LONG).show();
}
@Override
public void onSuccess() {
// Toast.makeText(getApplicationContext(),"YES",Toast.LENGTH_LONG).show();
}
@Override
public void onFailure() {
// Toast.makeText(getApplicationContext(),"NO",Toast.LENGTH_LONG).show();
}
};
if (!fd.DoesFileExist()) {
fd.Start(Image_callback); // get the data
}
//set data in adapter to show in listview
adapter = new MyBaseAdapter(MainActivity2.this, name_array, des_array, icon_array, roms_array,fav_array);
listView.setAdapter(adapter);
}
//store dada in database (name , des , icon , bin file(roms) , state)
database.insertData(name_array, des_array, icon_array, roms_array,"0");
} catch (Exception ex) {
}
}
}
};
DocMaker doc = new DocMaker();
doc.set(this, makeDocCallBack);
}
public static String getFileName(String url) {
String temp = url.substring(url.lastIndexOf('/') + 1, url.length());
if (temp.contains("?"))
temp = temp.substring(0, temp.indexOf("?"));
return temp;
}
public class MyBaseAdapter extends BaseAdapter {
private Activity activity;
private ArrayList title, desc, icon, roms,fav;
private LayoutInflater inflater = null;
public MyBaseAdapter(Activity a, ArrayList b, ArrayList c, ArrayList d, ArrayList e, ArrayList f) {
activity = a;
this.title = b;
this.desc = c;
this.icon = d;
this.roms = e;
this.fav=f;
inflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public int getCount() {
return title.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(final int position, View convertView, ViewGroup parent) {
View vi = convertView;
if (convertView == null)
vi = inflater.inflate(R.layout.list_item, null);
TextView title2 = (TextView) vi.findViewById(R.id.game_name); // title
String song = title.get(position).toString();
title2.setText(song);
TextView title22 = (TextView) vi.findViewById(R.id.game_des); // desc
String song2 = desc.get(position).toString();
title22.setText(song2);
File imageFile = new File("/storage/emulated/0/MyDirName/" + getFileName(icon_array.get(position)));
ImageView imageView = (ImageView) vi.findViewById(R.id.icon); // icon
imageView.setImageBitmap(BitmapFactory.decodeFile(imageFile.getAbsolutePath()));
TextView title222 = (TextView) vi.findViewById(R.id.game_roms); // desc
String song22 = roms.get(position).toString();
title222.setText(song22);
final Button dl_btn = (Button) vi.findViewById(R.id.dl_btn); // desc
final Button run_btn = (Button) vi.findViewById(R.id.play_btn); // desc
run_btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Preferences.DEFAULT_GAME_FILENAME = getFileName(roms_array.get(position));
Intent myIntent = new Intent(MainActivity2.this, FileChooser.class);
myIntent.putExtra(FileChooser.EXTRA_START_DIR, Preferences.getRomDir(MainActivity2.this));
Log.i("mhsnnn", Preferences.getTempDir(MainActivity2.this));
final int result = Preferences.MENU_ROM_SELECT;
startActivityForResult(myIntent, result);
}
});
dl_btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
MakeDocCallBack makeDocCallBack = new MakeDocCallBack() {
@Override
public void onResult(ArrayList<String> res) {
if (res.size() > 0) {
try {
jsonObject = new JSONObject(res.get(position));
roms_array.add(jsonObject.getString("downloadlink"));
GetFile fd1 = new GetFile(MainActivity2.this, path_image, getFileName(jsonObject.getString("downloadlink")), jsonObject.getString("downloadlink").toString(),null); //download the bin file
GetFileCallBack roms_callback = new GetFileCallBack() {
@Override
public void onStart() {
}
@Override
public void onProgress(long l, long l1) {
Log.i("nsr", "onProgress");
}
@Override
public void onSuccess() {
Log.i("nsr", "onSuccess");
dl_btn.setVisibility(View.GONE);
run_btn.setVisibility(View.VISIBLE);
}
@Override
public void onFailure() {
Log.i("nsr", "onFailure");
}
};
if (!fd1.DoesFileExist()) {
fd1.Start(roms_callback);
}
} catch (Exception ex) {
}
}
}
};
DocMaker doc = new DocMaker();
doc.set(MainActivity2.this, makeDocCallBack);
}
});
return vi;
}
}
@Override
public void onBackPressed() {
super.onBackPressed();
}
private boolean verifyExternalStorage() {
// check for sd card first
boolean mExternalStorageAvailable = false;
boolean mExternalStorageWriteable = false;
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
// rw access
mExternalStorageAvailable = mExternalStorageWriteable = true;
} else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
// r access
mExternalStorageAvailable = true;
mExternalStorageWriteable = false;
} else {
// no access
mExternalStorageAvailable = mExternalStorageWriteable = false;
}
// if we do not have storage warn user with dialog
if (!mExternalStorageAvailable || !mExternalStorageWriteable) {
AlertDialog.Builder dialog = new AlertDialog.Builder(this)
.setTitle(getString(R.string.app_name) + " Error")
.setMessage("External Storage not mounted, are you in disk mode?")
.setPositiveButton("Retry", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
init();
}
})
.setNeutralButton("Exit", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
finish();
}
});
dialog.show();
return false;
}
return true;
}
private void init() {
if (verifyExternalStorage() && !_init) {
// always try and make application dirs
String extStorageDirectory = Environment.getExternalStorageDirectory().toString();
Log.i("nsrrr1", extStorageDirectory);
// /storage/emulated/0
File myNewFolder = new File(extStorageDirectory + Preferences.DEFAULT_DIR);
Log.i("nsrrr2", extStorageDirectory + Preferences.DEFAULT_DIR);///storage/emulated/0/sega
if (!myNewFolder.exists()) {
myNewFolder.mkdir();
}
myNewFolder = new File(extStorageDirectory + Preferences.DEFAULT_DIR_ROMS);
Log.i("nsrrr3", extStorageDirectory + Preferences.DEFAULT_DIR);///storage/emulated/0/sega
if (!myNewFolder.exists()) {
myNewFolder.mkdir();
}
AssetManager assetManager = getAssets();
String[] files = null;
try {
files = assetManager.list(Preferences.DEFAULT_DIR_GAME);
Log.i("nsrrr3", files + "");
} catch (IOException e) {
Log.e("tag", "Failed to get asset file list.", e);
}
for (String filename : files) {
InputStream in = null;
OutputStream out = null;
try {
in = assetManager.open(Preferences.DEFAULT_DIR_GAME + "/" + filename);
File outFile = new File(myNewFolder, filename);
out = new FileOutputStream(outFile);
copyFile(in, out);
} catch (IOException e) {
Log.e("tag", "Failed to copy asset file: " + filename, e);
}
}
// do first run welcome screen
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
boolean firstRun = preferences.getBoolean(Preferences.PREF_FIRST_RUN, true);
if (firstRun) {
// remove first run flag
Editor edit = preferences.edit();
edit.putBoolean(Preferences.PREF_FIRST_RUN, false);
// default input
edit.putBoolean(Preferences.PREF_USE_DEFAULT_INPUT, true);
edit.commit();
}
// generate APK path for the native side
ApplicationInfo appInfo = null;
PackageManager packMgmr = this.getPackageManager();
try {
appInfo = packMgmr.getApplicationInfo(getString(R.string.package_name), 0);
} catch (PackageManager.NameNotFoundException e) {
e.printStackTrace();
throw new RuntimeException("Unable to locate assets, aborting...");
}
String _apkPath = appInfo.sourceDir;
// init the emulator
Emulator.init(_apkPath);
Log.i("rrrr", _apkPath);
// set the paths
Emulator.setPaths(extStorageDirectory + Preferences.DEFAULT_DIR,
extStorageDirectory + Preferences.DEFAULT_DIR_ROMS,
"",
"",
"");
// load up prefs now, never again unless they change
//PreferenceFacade.loadPrefs(this, getApplicationContext());
// load gui
// Log.d(LOG_TAG, "Done init()");
setContentView(R.layout.activity_main2);
// set title
super.setTitle(getString(R.string.app_name));
_init = true;
// Log.d(LOG_TAG, "Done onCreate()");
}
}
private void copyFile(InputStream in, OutputStream out) {
byte[] buffer = new byte[1024];
int read;
try {
while ((read = in.read(buffer)) != -1) {
out.write(buffer, 0, read);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
如何在我的数据库中创建方法呢？
答案 0 :(得分：0)
如果我理解正确，您可以添加一个表user_games，例如用户ID，游戏ID和状态，然后您可以在操作完成时更新状态。
例如，下载状态1，已下载或已完成状态2，您甚至可以添加下载失败等状态，以添加重新下载按钮...
你可以做点什么public void update_status(UserID,GameID) {
String update = "UPDATE games set status = 1 where id="+Game_ID+" and UserID = " + UserID);
db.rawQuery(update, null);
}