我有一个应用程序，在启动时在onCreate方法中复制资产文件夹中的数据。它在三个循环中完成，每个循环都有活动指示器，问题是当前两个循环运行白屏显示时，只有当第三个循环开始时，我才能看到带有指示器的活动屏幕。
代码如下
Realm realm;
ListView list;
int[] imageidsm = {R.drawable.fon_sovety350, R.drawable.fon_german350, R.drawable.fon_usa350, R.drawable.fon_uk350, R.drawable.fon_fr_it200, R.drawable.fon_japan_china200, R.drawable.fon_history200};
String[] itemname = {"СССР", "ГЕРМАНИЯ", "США", "ВЕЛИКОБРИТАНИЯ", "ФРАНЦИЯ И ИТАЛИЯ", "ЯПОНИЯ И КИТАЙ", "ИСТОРИЯ"};
Boolean firstLaunch = false;
SharedPreferences preferences;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
int height = metrics.heightPixels;
int width = metrics.widthPixels;
MainAdapter adapter = new MainAdapter(this, itemname, imageidsm, height, width);
list = (ListView) findViewById(R.id.mainListView);
list.setAdapter(adapter);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
if (position == 2) {
Intent toSssr = new Intent(MainActivity.this, TankListActivity.class);
toSssr.putExtra("category", "СССР");
startActivity(toSssr);
} else if (position == 3) {
Intent listActivity = new Intent(MainActivity.this, ArticleListActivity.class);
startActivity(listActivity);
}
}
});
RealmConfiguration realmConfiguration = new RealmConfiguration.Builder(this)
.name("db.realm")
.build();
realm.setDefaultConfiguration(realmConfiguration);
realm = Realm.getDefaultInstance();
preferences = getApplicationContext().getSharedPreferences("MyPreferences", Context.MODE_PRIVATE);
firstLaunch = preferences.getBoolean("firstLaunch", false);
if (firstLaunch == false) {
firstLaunch();
}
}
public void firstLaunch() {
String[] arrayOfCatLists = {"00f.json", "01f.json", "02f.json", "10f.json"};
String[] arrayOfArticles = {"32.json", "34.json", "44.json", "51.json", "33.json", "40.json", "41.json", "42.json", "52.json", "45.json", "37.json", "46.json", "36.json", "54.json", "35.json", "43.json", "47.json", "50.json", "49.json", "48.json", "56.json", "58.json", "53.json", "59.json" , "55.json", "60.json", "61.json"};
String[] arrayOfUsssr = {"62.json", "74.json", "75.json", "76.json", "63.json", "78.json", "79.json", "77.json", "81.json", "80.json"};
for (int i = 0; i < arrayOfCatLists.length; i++) {
new GetArticlesListFromDisk(arrayOfCatLists[i], i).execute();
}
for (int i = 0; i < arrayOfArticles.length; i++) {
new GetArticleFromDisk(arrayOfArticles[i]).execute();
}
for (int i = 0; i < arrayOfUsssr.length; i++) {
new GetTanksFromDisk(arrayOfUsssr[i]).execute();
}
firstLaunch = true;
SharedPreferences.Editor editor = preferences.edit();
editor.putBoolean("firstLaunch", firstLaunch);
editor.apply();
}
private class GetArticlesListFromDisk extends AsyncTask<String, Void, String> {
private String id;
private int index;
String[] arrayOfCatLists = {"00f.json", "01f.json", "02f.json"};
private GetArticlesListFromDisk(String id, int index) {
this.id = id;
this.index = index;
}
ProgressDialog pd = new ProgressDialog(MainActivity.this);
@Override
protected String doInBackground(String... params) {
String json = null;
try {
InputStream input = getApplicationContext().getAssets().open(id);
int size = input.available();
byte[] buffer = new byte[size];
input.read(buffer);
input.close();
json = new String(buffer, "UTF-8");
} catch (IOException e) {
e.printStackTrace();
}
return json;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
pd.setCancelable(false);
pd.setProgressStyle(android.R.style.Widget_ProgressBar_Small);
pd.setMessage("Минуточку, загружаемся");
pd.show();
}
@Override
protected void onPostExecute(String strJson) {
super.onPostExecute(strJson);
pd.dismiss();
JSONObject dataJsonObj = null;
String category = "";
try {
dataJsonObj = new JSONObject(strJson);
JSONArray listing = dataJsonObj.getJSONArray("listing");
for (int i = 0; i < listing.length(); i++) {
JSONObject object = listing.getJSONObject(i);
String id = object.getString("id");
String title = object.getString("title");
String subtitle = object.getString("subtitle");
String image = object.getString("image");
InputStream inputStream =null;
Bitmap bitmap = null;
try {
inputStream = getAssets().open(image);
bitmap = BitmapFactory.decodeStream(inputStream);
} catch (IOException e) {
e.printStackTrace();
}
Log.d("getArticleFromDisk", "Saved article " + title);
ImageStorage.saveToSdCard(bitmap, image, getApplicationContext());
if (index == 0) {
category = "Танковые сражения";
} else if (index == 1) {
category = "Справочник танкиста";
} else if (index == 2) {
category = "Танковые асы";
} else if (index == 3) {
category = "СССР";
} else if (index == 4) {
category = "Германия";
} else if (index == 5) {
category = "США";
} else if (index == 6) {
category = "Великобритания";
}
realm.beginTransaction();
ArticleList articleList = realm.createObject(ArticleList.class);
articleList.setId(id);
articleList.setTitle(title);
articleList.setSubtitle(subtitle);
articleList.setImage(image);
articleList.setCategory(category);
realm.commitTransaction();
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
private class GetArticleFromDisk extends AsyncTask<String, Void, String> {
private String id;
private int categoryIndex;
private GetArticleFromDisk(String id) {
this.id = id;
}
public String LOG_TAG = "GetArticleFromDisk";
HttpURLConnection urlConnection = null;
BufferedReader reader = null;
String resultJson = "";
ProgressDialog pd = new ProgressDialog(MainActivity.this);
@Override
protected String doInBackground(String... params) {
String json = null;
try {
InputStream input = getApplicationContext().getAssets().open(id);
int size = input.available();
byte[] buffer = new byte[size];
input.read(buffer);
input.close();
json = new String(buffer, "UTF-8");
} catch (IOException e) {
e.printStackTrace();
}
return json;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
pd.setCancelable(false);
pd.setProgressStyle(android.R.style.Widget_ProgressBar_Small);
pd.setMessage("Минуточку, загружаемся");
pd.show();
}
@Override
protected void onPostExecute(String strJson) {
super.onPostExecute(strJson);
pd.dismiss();
JSONObject dataJsonObj = null;
String category = "";
try {
dataJsonObj = new JSONObject(strJson);
JSONArray listing = dataJsonObj.getJSONArray("article");
for (int i = 0; i < listing.length(); i++) {
JSONObject object = listing.getJSONObject(i);
String id = object.getString("id");
String title = object.getString("title");
String subtitle = object.getString("subtitle");
String body = object.getString("body");
String hash = object.getString("content_version");
Log.d(LOG_TAG, "Saved article with id " + id);
realm.beginTransaction();
Article article = realm.createObject(Article.class);
article.setId(id);
article.setTitle(title);
article.setSubtitle(subtitle);
article.setBody(body);
article.setHash(hash);
realm.commitTransaction();
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
private class GetTanksFromDisk extends AsyncTask<String, Void, Tank> {
private String id;
private int categoryIndex;
private GetTanksFromDisk(String id) {
this.id = id;
}
public String LOG_TAG = "GetTankFromDisk";
HttpURLConnection urlConnection = null;
BufferedReader reader = null;
String resultJson = "";
ProgressDialog pd = new ProgressDialog(MainActivity.this);
Tank tank = new Tank();
@Override
protected void onPreExecute() {
super.onPreExecute();
Log.d(LOG_TAG, "Entered preExecute");
pd.setCancelable(false);
pd.setProgressStyle(android.R.style.Widget_ProgressBar_Small);
pd.setMessage("Минуточку, загружаемся");
pd.show();
}
@Override
protected Tank doInBackground(String... params) {
String json = null;
try {
InputStream input = getApplicationContext().getAssets().open(id);
int size = input.available();
byte[] buffer = new byte[size];
input.read(buffer);
input.close();
json = new String(buffer, "UTF-8");
} catch (IOException e) {
e.printStackTrace();
}
JSONObject dataJsonObj = null;
String category = "";
try {
dataJsonObj = new JSONObject(json);
JSONArray listing = dataJsonObj.getJSONArray("article");
for (int i = 0; i < listing.length(); i++) {
JSONObject object = listing.getJSONObject(i);
String id = object.getString("id");
String title = object.getString("title");
JSONArray signatures = object.getJSONArray("signatures");
ArrayList<String> signatures_list = new ArrayList<String>();
for (int j = 0; j < signatures.length(); j++) {
signatures_list.add(signatures.get(j).toString());
}
String signatures_string = Joiner.on(",").join(signatures_list);
String body = object.getString("body");
String construction = object.getString("construction");
String modification = object.getString("modification");
String ttx = object.getString("ttx");
JSONObject images = object.getJSONObject("images");
JSONArray tank_slider = images.getJSONArray("tank_slider");
ArrayList<String> tank_slider_list = new ArrayList<String>();
for (int k = 0; k < tank_slider.length(); k++) {
InputStream inputStream =null;
Bitmap bitmap = null;
try {
inputStream = getAssets().open(tank_slider.getString(k));
bitmap = BitmapFactory.decodeStream(inputStream);
} catch (IOException e) {
e.printStackTrace();
}
ImageStorage.saveToSdCard(bitmap, tank_slider.getString(k), getApplicationContext());
tank_slider_list.add(tank_slider.getString(k));
}
String tank_slider_string = Joiner.on(",").join(tank_slider_list);
String hash = object.getString("content_version");
Log.d(LOG_TAG, "Imported from assets tank with id " + id);
tank.setId(id);
tank.setTitle(title);
tank.setSignatures(signatures_string);
tank.setBody(body);
tank.setConstruction(construction);
tank.setModification(modification);
tank.setTtx(ttx);
tank.setTank_slider(tank_slider_string);
tank.setHash(hash);
}
} catch (JSONException e) {
e.printStackTrace();
}
return tank;
}
@Override
protected void onPostExecute(Tank tank) {
super.onPostExecute(tank);
pd.dismiss();
realm.beginTransaction();
Tank newTank = realm.createObject(Tank.class);
newTank.setId(tank.getId());
newTank.setTitle(tank.getTitle());
newTank.setSignatures(tank.getSignatures());
newTank.setBody(tank.getBody());
newTank.setConstruction(tank.getConstruction());
newTank.setModification(tank.getModification());
newTank.setTtx(tank.getTtx());
newTank.setTank_slider(tank.getTank_slider());
newTank.setHash(tank.getHash());
realm.commitTransaction();
}
}
我做错了什么？