Issue
Am using retrofit to fetch data..I tried to launch the app from from widget. But the app is crashing because of the null object. I tried checking the object...it is not null after fetching data from API but later it is becoming null .. why ? is there any way to properly fetch data.. how apps fetch data after widget clicking ?
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.master_list);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
//Checking to see if the app is opened by widget by checking existence of startFromWidget value from intent
if (getIntent().getExtras().getString("stringFromWidget") != null) {
//App opened by widget
fromWidget = true;
//Getting last stored value from Database assign it to temp
Cursor c = getContentResolver().query(DBContract.CONTENT_URI, null, null, null);
assert c != null;
c.moveToFirst();
String temp = c.getString(c.getColumnIndex(DBContract.RECIPE_NAME));
//Fetching data from API
ApiInterface apiService = ApiClient.getClient().create(ApiInterface.class);
Call<List<ApiResponce>> call = apiService.getResponce();
call.enqueue(new Callback<List<ApiResponce>>() {
@Override
public void onResponse(Call<List<ApiResponce>> call, Response<List<ApiResponce>> response) {
reciepeObject = response.body().get(3);
//Making sure data is received
Toast.makeText(MasterListClass.this, reciepeObject.getName(), Toast.LENGTH_SHORT).show();//No null object error ...working fine
}
@Override
public void onFailure(Call<List<ApiResponce>> call, Throwable t) {
Log.e("networkError", t.getMessage());
}
});
}
//if the app not opened by widget get the object from the intent
else {
reciepeObject = getIntent().getParcelableExtra(getString(R.string.object));
}
//Null Object error from recipeObject.getName().. why ?
getSupportActionBar().setTitle(reciepeObject.getName());
Logcat:
05-11 12:42:48.558 6978-6978/facebooklogintest.cavepass.com.bakingapp E/AndroidRuntime: FATAL EXCEPTION: main Process: facebooklogintest.cavepass.com.bakingapp, PID: 6978 java.lang.RuntimeException: Unable to start activity ComponentInfo{facebooklogintest.cavepass.com.bakingapp/facebooklogintest.cavepass.com.bakingapp.UI.MasterListClass}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String facebooklogintest.cavepass.com.bakingapp.ModelClasses.ApiResponce.getName()' on a null object reference at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2817) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892) at android.app.ActivityThread.-wrap11(Unknown Source:0) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593) at android.os.Handler.dispatchMessage(Handler.java:105) at android.os.Looper.loop(Looper.java:164) at android.app.ActivityThread.main(ActivityThread.java:6541) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767) Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String facebooklogintest.cavepass.com.bakingapp.ModelClasses.ApiResponce.getName()' on a null object reference at facebooklogintest.cavepass.com.bakingapp.UI.MasterListClass.onCreate(MasterListClass.java:100) at android.app.Activity.performCreate(Activity.java:6975) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1213) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2770) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892) at android.app.ActivityThread.-wrap11(Unknown Source:0) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593) at android.os.Handler.dispatchMessage(Handler.java:105) at android.os.Looper.loop(Looper.java:164) at android.app.ActivityThread.main(ActivityThread.java:6541) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767) 05-11 12:42:48.621 2661-6708/com.google.android.googlequicksearchbox:search E/ContentStoreEUAS: Failed to commit the deferred actions 05-11 12:42:49.066 2057-2086/system_process E/ActivityManager: applyOptionsLocked: Unknown animationType=0
Solution
Move
getSupportActionBar().setTitle(reciepeObject.getName());
inside onResponse
call.enqueue(new Callback<List<ApiResponce>>() {
@Override
public void onResponse(Call<List<ApiResponce>> call, Response<List<ApiResponce>> response) {
reciepeObject = response.body().get(3);
getSupportActionBar().setTitle(reciepeObject.getName());
//^^^^^^^^^^^^
Toast.makeText(MasterListClass.this, reciepeObject.getName(), Toast.LENGTH_SHORT).show();//No null object error ...working fine
}
@Override
public void onFailure(Call<List<ApiResponce>> call, Throwable t) {
Log.e("networkError", t.getMessage());
}
});
because REST calls are asynchronous so will take some time to complete and the response can only be used once onResponse
is triggered
Answered By - Pavneet_Singh
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