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Es ist mein erstes Mal mit einem Fortschrittsbalken, ich habe eine HTTP-Anfrage gemacht. Ich möchte, dass ein unbestimmter Fortschrittsbalken angezeigt wird, wenn der Benutzer auf die Anmeldeschaltfläche klickt und dann verschwindet, wenn die Antwort empfangen wird. Unten ist was ich schon habe, aber der Fortschrittsbalken wird nicht angezeigt.Wie bekomme ich Fortschrittsbalken um anzuzeigen
unten ist die login.xml
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/myCoordinatorLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center_horizontal"
android:orientation="vertical"
tools:context=".app.LoginActivity">
<android.support.v7.widget.Toolbar
android:id="@+id/toolBar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/colorPrimary">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:contentDescription="logo"
android:src="@drawable/bar" />
</android.support.v7.widget.Toolbar>
<ScrollView
android:id="@+id/login_form"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:id="@+id/icons_container"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="40dp">
<!-- Login progress -->
<ProgressBar
android:id="@+id/login_progress"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:indeterminate="true"
android:visibility="invisible" />
<EditText
android:id="@+id/email"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Email here"
android:maxLines="1"
android:singleLine="true" />
<EditText
android:id="@+id/password"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Password"
android:imeActionId="@+id/login"
android:imeActionLabel="Password here"
android:imeOptions="actionUnspecified"
android:inputType="textPassword"
android:maxLines="1"
android:singleLine="true" />
<Button
android:id="@+id/email_sign_in_button"
style="?android:textAppearanceSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginTop="16dp"
android:text="Login"
android:textStyle="bold" />
</LinearLayout>
</ScrollView>
</LinearLayout>
</android.support.design.widget.CoordinatorLayout>
unter dem Login-Aktivität
public class loginActivity extends AppCompatActivity {
public final static String EXTRA_MESSAGE = "solutions.orbs.com.myapplication.app";
EditText email, password;
Button login;
String emailCred, passwordCred;
ProgressBar progressBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
email = (EditText) findViewById(R.id.email);
password = (EditText) findViewById(R.id.password);
progressBar = (ProgressBar) findViewById(R.id.login_progress);
ConnectivityManager cm = (ConnectivityManager) this.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
final boolean isConnected = activeNetwork != null && activeNetwork.isConnectedOrConnecting();
login = (Button) findViewById(R.id.email_sign_in_button);
login.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
progressBar.setVisibility(ProgressBar.VISIBLE);
emailCred = email.getText().toString();
passwordCred = password.getText().toString();
if (emailCred.isEmpty()) {
email.setError("Enter your Email");
} else if (passwordCred.isEmpty()) {
password.setError("Enter your Password");
} else if (!isConnected) {
Snackbar.make(findViewById(R.id.myCoordinatorLayout), "Sorry,Please connect to a network", Snackbar.LENGTH_SHORT).show();
} else {
makeRequest(emailCred, passwordCred);
}
}
});
}
public void makeRequest(final String user, final String cred) {
//the url we are posting the request to
String url = "http://mobile.map.education/api/login";
//the post request function
StringRequest postRequest = new StringRequest(Request.Method.POST, url,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
progressBar.setVisibility(ProgressBar.INVISIBLE);
try {
//the json object represents the response we are expecting and status is the status of the request
//which will either be a success or an error and will be sent to us from the server
JSONObject jsonResponse = new JSONObject(response);
String status = jsonResponse.getString("status");
//handler for if the response is an error
if (status.equalsIgnoreCase("error")) {
progressBar.setVisibility(ProgressBar.INVISIBLE);
//display and error message to the user using the snackbar notifier
Snackbar.make(findViewById(R.id.myCoordinatorLayout), jsonResponse.getString("message"), Snackbar.LENGTH_LONG).show();
}
//handler for is the login is successful
else if (status.equalsIgnoreCase("success")) {
//this is the token granted to us by the server
String token = jsonResponse.getString("token");
progressBar.setVisibility(ProgressBar.INVISIBLE);
//this starts an intent that sends us to the dashboard page of the application
Intent loader = new Intent(loginActivity.this, MainActivity.class);
loader.putExtra(EXTRA_MESSAGE, token);
startActivity(loader);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
},
//this handles any errors the volley package gets
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
error.printStackTrace();
}
}
) {
//this is a method to set the parameters we are sending to be in the proper format
@Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<>();
//the proper format of the login parameters is portal[parameter name goes here]
params.put("portal[username]", user);
params.put("portal[password]", cred);
params.put("portal[From]", "web");
return params;
}
};
//this is a retry policy that has been set to deal with timeout errors
postRequest.setRetryPolicy(new DefaultRetryPolicy(
10000,
DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
Volley.newRequestQueue(getApplicationContext()).add(postRequest);
}
}