How to make progress bar invisible after load image? - android-studio

When my app is installed I want to see a progress bar until the image is loaded by an API call. After that, I want to make it invisible.
Here is the code:
public class MainActivity extends AppCompatActivity {
private ImageView imageView;
// ...
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageView=findViewById(R.id.imageView);
loud();
}
private void loud(){
setProgressBarVisibility(true);
RequestQueue queue = Volley.newRequestQueue(this);
String url ="https://meme-api.herokuapp.com/gimme";
// Request a string response from the provided URL.
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.GET, url, null, new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
String url= null;
try {
url = response.getString("url");
} catch (JSONException e) {
e.printStackTrace();
}
setProgressBarVisibility(false);
Glide.with(MainActivity.this).load(url).into(imageView);
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Log.d("ERROR ","Error ");
}
});
queue.add(jsonObjectRequest);
}

Related

i need to get jpg from arduino host to android

So i need to get picture from host, arduino is host with the esp32 and the camera. Arduino is hosting picture on local wifi and I can access that picture by typing ip. Now I need help with the android studio part to get the image from the ip.
So this is the code from android studio and its not working.
public class MainActivity extends AppCompatActivity {
private ImageView imageView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageView = findViewById(R.id.image_view);
new DownloadImageTask().execute("http://192.168.1.8/");
}
private class DownloadImageTask extends AsyncTask<String, Void, Bitmap> {
#Override
protected Bitmap doInBackground(String... urls) {
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder()
.url(urls[0])
.build();
try (Response response = client.newCall(request).execute()) {
if (!response.isSuccessful()) {
throw new IOException("Unexpected code " + response.code());
}
byte[] bytes = response.body().bytes();
return BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
#Override
protected void onPostExecute(Bitmap bitmap) {
imageView.setImageBitmap(bitmap);
}
}
}

Android Studio: How to send data from Activity to Fragment | Method invocation 'getString' may produce 'NullPointerException'

I am having a problem where in the Fragment the "getString()" says "Method invocation 'getString' may produce 'NullPointerException'" that's the only problem. The Fragment is stored in MainActivity in Navigation Window.
LoginActivity (Where MainActivity is getting the Data):
private void LoginMethod(String email, String password) {
StringRequest stringRequest = new StringRequest(Request.Method.POST, URL, new Response.Listener() {
#Override
public void onResponse(String response) {
try {
JSONObject jsonObject = new JSONObject(response);
String result = jsonObject.getString("success");
JSONArray jsonArray = jsonObject.getJSONArray("login");
if (result.equals("1")){
for (int i = 0; i < jsonArray.length(); i++){
JSONObject object = jsonArray.getJSONObject(i);
String username = object.getString("Username").trim();
String email = object.getString("Email").trim();
Toast.makeText(Login.this, "Login Success: " + username, Toast.LENGTH_SHORT).show();
Intent intent = new Intent(Login.this, MainActivity.class);
intent.putExtra("username", username);
intent.putExtra("email", email);
startActivity(intent);
}
}
else if (result.equals("0")) {
Toast.makeText(Login.this, "Login Failed" + result + response, Toast.LENGTH_LONG).show(); Log.e("JSON Error", response);
Log.e("Login Error", result);
}
}
catch (JSONException e){
Toast.makeText(Login.this, e.getMessage(), Toast.LENGTH_LONG).show();
Log.e("JSON Error", response);
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(Login.this, error.getMessage(), Toast.LENGTH_SHORT).show();
}
})
{
#Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> params = new HashMap<>();
params.put("Email", email);
params.put("Password", password);
return params;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
**MainActivity:**
public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
Toolbar toolbar;
TextView getemail, getusername;
DrawerLayout drawerLayout;
NavigationView navigationView;
View navheader;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Log.i("State","onCreate");
toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
drawerLayout = findViewById(R.id.drawerLayout);
navigationView = findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
navheader = navigationView.getHeaderView(0);
String getUsername = getIntent().getStringExtra("username");
String getEmail = getIntent().getStringExtra("email");
getusername = navheader.findViewById(R.id.getusername);
getemail = navheader.findViewById(R.id.getemail);
toolbar.setTitle(getUsername);
getusername.setText(getUsername);
getemail.setText(getEmail);
ActionBarDrawerToggle actionBarDrawerToggle = new ActionBarDrawerToggle(this, drawerLayout, toolbar,
R.string.nav_drawer_open, R.string.nav_drawer_close);
drawerLayout.addDrawerListener(actionBarDrawerToggle);
actionBarDrawerToggle.syncState();
if (savedInstanceState == null){
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,
new Home()).commit();
navigationView.setCheckedItem(R.id.home);
}
}
public void getAccountFragmentData(){
String test = "akshdasjkdhsajkdasdas";
String test2 = "wadahawawaawaww";
Bundle bundle = new Bundle();
bundle.putString("username", test);
bundle.putString("email", test2);
Account account = new Account();
account.setArguments(bundle);
Toast.makeText(this, "Account", Toast.LENGTH_SHORT).show();
}
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
switch (item.getItemId()){
case R.id.home:
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,
new Home()).commit();
break;
case R.id.orderfood:
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,
new FoodOrder()).commit();
break;
case R.id.account:
getAccountFragmentData();
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,
new Account()).commit();
break;
case R.id.settings:
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,
new Settings()).commit();
break;
case R.id.email:
Toast.makeText(this, "Email", Toast.LENGTH_SHORT).show();
break;
case R.id.share:
Toast.makeText(this, "Share", Toast.LENGTH_SHORT).show();
break;
}
drawerLayout.closeDrawer(GravityCompat.START);
return true;
}
#Override
public void onBackPressed() {
if (drawerLayout.isDrawerOpen(GravityCompat.START)){
drawerLayout.closeDrawer(GravityCompat.START);
}
else {
super.onBackPressed();
}
}
#Override
protected void onStart() {
super.onStart();
Log.i("State","onStart");
}
#Override
protected void onResume() {
super.onResume();
Log.i("State","onResume");
}
#Override
protected void onPause() {
super.onPause();
Log.i("State","onPause");
}
#Override
protected void onStop() {
super.onStop();
Log.i("State","onStop");
}
#Override
protected void onRestart() {
super.onRestart();
Log.i("State","onRestart");
}
#Override
protected void onDestroy() {
super.onDestroy();
Log.i("State","onDestroy");
}
}
**Fragment:
**
public class Account extends Fragment {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View v = inflater.inflate(R.layout.fragment_account, container, false);
TextView getUsername = v.findViewById(R.id.username);
TextView getEmail = v.findViewById(R.id.email);
Bundle bundle = this.getArguments();
String setUsername = bundle.getString("username");
String setEmail = bundle.getString("email");
getUsername.setText(setUsername);
getEmail.setText(setEmail);
Log.i("Data Sent", "Sent");
return v;
}
I want the Fragment to get the data from MainActivity.

how to open link from webview?

I'm new, just learning, don't swear. There is a task. A line comes in, it contains an HTML file with text and links, the webView layout is loaded, I display a line in the webView that contains a link, do I need to click on this link so that it opens in the browser on the phone?
public class MainActivity extends AppCompatActivity {
private String unEncodedHtml = "Hello https://nba.com";
#SuppressLint("SetJavaScriptEnabled")
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
WebView webView = new WebView(this);
setContentView(webView);
String encodedHtml = Base64.encodeToString(unEncodedHtml.getBytes(), Base64.NO_PADDING);
webView.getSettings().setJavaScriptEnabled(true);
webView.getSettings().setSupportZoom(true);
webView.getSettings().setBuiltInZoomControls(true);
webView.setWebViewClient(new myWebViewClient());
webView.loadData(encodedHtml, "text/html", "base64");
String url = webView.getUrl();
Log.d("zzz", "url: "+url);
}
public class myWebViewClient extends WebViewClient {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
startActivity(intent);
view.loadUrl(url);
return true;
}
}
}
try this.....
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (url.contains("your_display_line")) {
Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
startActivity(browserIntent);
return true;
} else {
view.loadUrl(url);
return true;
}
}

I want to know how to randomly display images in gridview through SwipeRefreshLayout

SwipeRefreshLayout refreshLayout = findViewById(R.id.refresh_grid);
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
#Override
public void onRefresh() {
getImages();
refreshLayout.setRefreshing(false);
}
});
getImages();
}
I want to know how to randomly display images in gridview through SwipeRefreshLayout
I want a UI like the site https://www.pinterest.com
I want to show random images on refresh to show a lot of images, can you tell me how?
thank you in advance
Below is the full code.
public class MainActivity extends AppCompatActivity {
private List<String> mImagesLinks = new ArrayList<>();
private GridView mGridView;
FloatingActionButton option_01;
FloatingActionButton option_02;
FloatingActionButton option_03;
FloatingActionButton option_04;
static final int PERMISSIONS_REQUEST = 0x0000001;
//종료팝업 전면광고 추가
private static final String TAG = "ted";
TedAdmobDialog nativeTedAdmobDialog;
int nCurrentPermission = 0;
private AdView mAdView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
MobileAds.initialize(this, getString(R.string.admob_app_id));
mAdView = findViewById(R.id.adView);
AdRequest adRequest = new AdRequest.Builder().build();
mAdView.loadAd(adRequest);
checkPermission();
mGridView = findViewById(R.id.grid_view);
mGridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
startActivity(new Intent(MainActivity.this, ImageActivity.class)
.putExtra("Link", mImagesLinks.get(i)));
}
});
option_01 = findViewById(R.id.option_01);
option_01.setOnClickListener(v -> {
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("https://play.google.com/store/apps/details?id=" + getPackageName()));
startActivity(intent);
});
option_02 = findViewById(R.id.option_02);
option_02.setOnClickListener(v -> {
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("https://play.google.com/store/apps/developer?id=Project+J+Lab"));
startActivity(intent);
});
option_03 = findViewById(R.id.option_03);
option_03.setOnClickListener(v -> {
Intent myintent = new Intent(Intent.ACTION_SEND);
myintent.setType("text/plan");
String shereBoday = "Your Boday Here";
String shereSub = "\"http://play.google.com/store/apps/details?id=" + getPackageName();
myintent.putExtra(Intent.EXTRA_SUBJECT, shereBoday);
myintent.putExtra(Intent.EXTRA_TEXT, shereSub);
startActivity(Intent.createChooser(myintent, "shere Using"));
});
option_04 = findViewById(R.id.option_04);
option_04.setOnClickListener(v -> {
Intent email = new Intent(Intent.ACTION_SEND);
email.setType("plain/text");
String[] address = {"dhsthdwjd1#gmail.com"};
email.putExtra(Intent.EXTRA_EMAIL, address);
email.putExtra(Intent.EXTRA_SUBJECT, getPackageName());
email.putExtra(Intent.EXTRA_TEXT, "text");
startActivity(email);
});
SwipeRefreshLayout refreshLayout = findViewById(R.id.refresh_grid);
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
#Override
public void onRefresh() {
getImages();
refreshLayout.setRefreshing(false);
}
});
getImages();
}
private void getImages() {
Call<List<String>> imagesResponse = NetworkUtils.getInterface().loadImages();
imagesResponse.enqueue(new Callback<List<String>>() {
#Override
public void onResponse(Call<List<String>> call, Response<List<String>> response) {
if (response.isSuccessful()) {
mImagesLinks = response.body();
ImagesAdapter imagesAdapter = new ImagesAdapter(MainActivity.this, mImagesLinks);
mGridView.setAdapter(imagesAdapter);
imagesAdapter.notifyDataSetChanged();
} else {
Toast.makeText(MainActivity.this, R.string.error_response, Toast.LENGTH_SHORT).show();
}
}
#Override
public void onFailure(Call<List<String>> call, Throwable t) {
Toast.makeText(MainActivity.this, t.getLocalizedMessage(), Toast.LENGTH_LONG).show();
}
});
}
#Override
public void onBackPressed() {
//종료팝업 전면광고 추가
nativeTedAdmobDialog = new TedAdmobDialog.Builder(MainActivity.this, TedAdmobDialog.AdType.NATIVE, getString(R.string.banner_ad_unit_id_native))
.setOnBackPressListener(new OnBackPressListener() {
#Override
public void onReviewClick() {
}
#Override
public void onFinish() {
finish();
}
#Override
public void onAdShow() {
log("onAdShow");
nativeTedAdmobDialog.loadNative();
}
})
.create();
nativeTedAdmobDialog.show();
}
//종료팝업 전면광고 추가
private void log(String text) {
Log.d(TAG, text);
}
private void checkPermission() {
PermissionListener permissionlistener = new PermissionListener() {
#Override
public void onPermissionGranted() {
}
#Override
public void onPermissionDenied(List<String> deniedPermissions) {
}
};
TedPermission.with(this)
.setPermissionListener(permissionlistener)
.setPermissions(
Manifest.permission.INTERNET,
Manifest.permission.ACCESS_NETWORK_STATE,
Manifest.permission.WRITE_EXTERNAL_STORAGE,
Manifest.permission.READ_EXTERNAL_STORAGE,
Manifest.permission.SET_WALLPAPER,
Manifest.permission.READ_CONTACTS)
.check();
}
}
Just use Collections.shuffle(list); in your getImages() function.
Refer this for more information : https://www.geeksforgeeks.org/shuffle-or-randomize-a-list-in-java/

Why my variables are set to null after i volley call is succeed

I do not why my private variable values are getting to null after the Volley request
When i am printing the values in onResponse, i am getting required values, but after volley request is completed, I am getting null.
ListView userListView;
StringRequest stringRequest=null;
ProgressDialog progressDialog;
private String[] strUsername;
private String[] strUserItems;
private String[] strUserImagePaths;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_user_listing);
userListView=findViewById(R.id.userListView);
progressDialog=new ProgressDialog(this);
StrictMode.setThreadPolicy((new StrictMode.ThreadPolicy.Builder().permitNetwork().build()));
displayUserListing();
UserListCustomViewAdapter viewAdapter=new UserListCustomViewAdapter(this,strUsername,strUserImagePaths,strUserItems);
userListView.setAdapter(viewAdapter);
}
private void displayUserListing()
{
progressDialog.setMessage("Getting User List...");
progressDialog.show();
stringRequest=new StringRequest(
Request.Method.GET, Constants.URL_GetUserList, new Response.Listener<String>()
{
#Override
public void onResponse(String response)
{
progressDialog.dismiss();
try {
Log.d("first","before");
JSONArray jsonObj=new JSONArray(response);
strUsername=new String[jsonObj.length()];
strUserItems=new String[jsonObj.length()];
strUserImagePaths=new String[jsonObj.length()];
String str=null;
for(int i=0;i<jsonObj.length();i++)
{
JSONObject jsonObject=jsonObj.getJSONObject(i);
strUsername[i]=jsonObject.getString("user_name");
strUserItems[i]=jsonObject.getString("user_item");
strUserImagePaths[i]=jsonObject.getString("user_image_path");
str+=strUsername[i];
}
Log.d("first","after"+str);
}catch (Exception e)
{
e.printStackTrace();
}
}
}, new Response.ErrorListener()
{
#Override
public void onErrorResponse(VolleyError error)
{
progressDialog.hide();
Log.d("myerror","I got some error");
NetworkResponse networkResponse = error.networkResponse;
Log.d("myerror1",error.getMessage());
// Toast.makeText(getApplicationContext(),error.getMessage().toString(),Toast.LENGTH_LONG).show();
}
})
{
#Override
protected Map<String, String> getParams() throws AuthFailureError
{
Map<String,String> params=new HashMap<String,String>();
params.put("struserid","1");
//params.put("serviceid","1");
return params;
}
};
RequestHandler.getInstance(this).addToRequestQueue(stringRequest);
}
I think you are using your variables before initializing it. Call the adapter after you parsing value.

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