When running my app, it crashes when I try to read Json
MainActivity.java
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
String login;
String nome;
int id;
String medico;
String paciente;
public static String get(String urlString){
HttpURLConnection urlConnection = null;
BufferedReader reader = null;
String resposta = null;
try {
URL url = new URL(urlString);
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.connect();
InputStream in = new BufferedInputStream(urlConnection.getInputStream());
reader = new BufferedReader(new InputStreamReader(in));
String line = "";
StringBuffer buffer = new StringBuffer();
while ((line = reader.readLine()) != null){
buffer.append(line);
}
resposta = buffer.toString();
}catch (Exception e){
e.printStackTrace();
}finally {
if (urlConnection != null){
urlConnection.disconnect();
}
try {
reader.close();
}catch (Exception e){
e.printStackTrace();
}
}
return resposta;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
Bundle extras = getIntent().getExtras();
if(extras != null)
{
nome = extras.getString("nome");
}
super.onCreate(savedInstanceState);
String resposta = this.get("http://infasstec.com.br/desenvolvimento/android/file.json");
Log.e("e",resposta);
JSONObject obj = null;
try {
obj = new JSONObject(resposta);
} catch (JSONException e) {
e.printStackTrace();
}
try {
id = obj.getInt("id");
medico = obj.getString("medico");
paciente = obj.getString("paciente");
} catch (JSONException e) {
e.printStackTrace();
}
Json
[{"id":"1","medico":"a","paciente":"a","cabertas":"1","cfechadas":"0","descricao":"a","receita":"a","horario":"2017-07-19 03:25:00","idmedico":"1","idpaciente":"2"},{"id":"2","medico":"b","paciente":"b","cabertas":"0","cfechadas":"1","descricao":"b","receita":"b","horario":"2017-07-26 09:28:00","idmedico":"2","idpaciente":"2"}]
Error
07-19 11:53:14.695 10118-10118/com.example.rohwedder.login E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.rohwedder.login, PID: 10118
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.rohwedder.login/com.example.matheus.login.MainActivity}: java.lang.NullPointerException: println needs a message
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2665)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
Caused by: java.lang.NullPointerException: println needs a message
at android.util.Log.println_native(Native Method)
at android.util.Log.e(Log.java:236)
at com.example.matheus.login.MainActivity.onCreate(MainActivity.java:85)
at android.app.Activity.performCreate(Activity.java:6679)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2618)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
error
at com.example.matheus.login.MainActivity.onCreate(MainActivity.java:85)
refers to this line in codeLog.e("e",resposta);