App stürzt wegen Knopf (?)

Question

Ich bin wirklich neu in der Codierung und ich habe eine Frage. Ok, ich versuche, ein benutzerdefiniertes ListView mit einigen Strings zu erstellen, die ich mit jSoup geparst habe, aber aus irgendeinem Grund funktioniert es nicht, es kompiliert, aber wenn es auf dem Emulator läuft, stürzt die App einfach ab. Hier ist der Code und der Debugger:

package davidgb.baseballspain; 


import android.os.AsyncTask; 
import android.os.Bundle; 
import android.support.v7.app.AppCompatActivity; 
import android.view.ViewGroup; 
import android.widget.BaseAdapter; 
import android.widget.Button; 
import android.widget.ListView; 
import android.widget.TextView; 

import org.jsoup.Jsoup; 
import org.jsoup.nodes.Document; 
import org.jsoup.select.Elements; 

//272 
public class MainActivity extends AppCompatActivity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 




    Button but1 = (Button) findViewById(R.id.but); 
    but1.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 

      new doit().execute(); 
     } 
    });} 


public class doit extends AsyncTask<Void, Void, Void> { 
    ListView lista = (ListView)findViewById(R.id.lista); 
@Override 
     protected void onPostExecute(Void aVoid) { 
    CustomAdapter customAdapter = new CustomAdapter(); 
    lista.setAdapter(customAdapter);} 

String result1; 

String result2; 


String result3; 
String result4; 
String result5; 
String result6; 
String result7; 
String result8; 
String result9; 
String result10; 
String result11; 
String result12; 
String result13; 
String result14; 
String result15; 
String result16; 
String result17; 
String result18; 
String result19; 
String result20; 
String result21; 
String result22; 
String result23; 
String result24; 
String result25; 
String result26; 
String result27; 
String result28; 
String result29; 
String result30; 
String result31; 
String result32; 
String result33; 
String result34; 
String result35; 
String result36; 
String result37; 
String result38; 
String result39; 
String result40; 
String result41; 
String result42; 
String result43; 
String result44; 
String result45; 
String result46; 
String result47; 
String result48; 
String result49; 
String result50; 
String result51; 
String result52; 
String result53; 
String result54; 
String result55; 
String result56; 
String result57; 
String result58; 
String result59; 
String result60; 
String result61; 
String result62; 
String result63; 
String result64; 
String result65; 
String result66; 
String result67; 
String result68; 
String result69; 
String result70; 
String result71; 
String result72; 
String result73; 
String result74; 
String result75; 
String result76; 
String result77; 
String result78; 
String result79; 
String result80; 
String result81; 
String result82; 
String result83; 
String result84; 
String result85; 
String result86; 
String result87; 
String result88; 
String result89; 
String result90; 
String result91; 
String result92; 
String result93; 
String result94; 
String result95; 
String result96; 
String result97; 
String result98; 
String result99; 
String result100; 
String result101; 
String result102; 
String result103; 
String result104; 
String result105; 
String result106; 
String result107; 
String result108; 
String result109; 
String result110; 
String result111; 
String result112; 
String result113; 
String result114; 
String result115; 
String result116; 
String result117; 
String result118; 
String result119; 
String result120; 
String result121; 
String result122; 
String result123; 
String result124; 
String result125; 
String result126; 
String result127; 
String result128; 
String result129; 
String result130; 
String result131; 
String result132; 
String result133; 
String result134; 
String result135; 
String result136; 
String result137; 
String result138; 
String result139; 
String result140; 
String result141; 
String result142; 
String result143; 
String result144; 
String result145; 
String result146; 
String result147; 
String result148; 
String result149; 
String result150; 
String result151; 
String result152; 
String result153; 
String result154; 
String result155; 
String result156; 
String result157; 
String result158; 
String result159; 
String result160; 
String result161; 
String result162; 
String result163; 
String result164; 
String result165; 
String result166; 
String result167; 
String result168; 
String result169; 
String result170; 
String result171; 
String result172; 
String result173; 
String result174; 
String result175; 
String result176; 
String result177; 
String result178; 
String result179; 
String result180; 
String result181; 
String result182; 
String result183; 
String result184; 
String result185; 
String result186; 
String result187; 
String result188; 
String result189; 
String result190; 
String result191; 
String result192; 
String result193; 
String result194; 
String result195; 
String result196; 
String result197; 
String result198; 
String result199; 
String result200; 
String result201; 
String result202; 
String result203; 
String result204; 
String result205; 
String result206; 
String result207; 
String result208; 
String result209; 
String result210; 
String result211; 
String result212; 
String result213; 
String result214; 
String result215; 
String result216; 
String result217; 
String result218; 
String result219; 
String result220; 
String result221; 
String result222; 
String result223; 
String result224; 
String result225; 
String result226; 
String result227; 
String result228; 
String result229; 
String result230; 
String result231; 
String result232; 
String result233; 
String result234; 
String result235; 
String result236; 
String result237; 
String result238; 
String result239; 
String result240; 
String result241; 
String result242; 
String result243; 
String result244; 
String result245; 
String result246; 
String result247; 
String result248; 
String result249; 
String result250; 
String result251; 
String result252; 
String result253; 
String result254; 
String result255; 
String result256; 
String result257; 
String result258; 
String result259; 
String result260; 
String result261; 
String result262; 
String result263; 
String result264; 
String result265; 
String result266; 
String result267; 
String result268; 
String result269; 
String result270; 
String result271; 
String result272; 


String[] resultsizq = {result1, result3, result5, result7, result9, result11, result13, result15, result17, result19, result21, result23, result25, result27, result29, result31, result33, result35, result37, result39, result41, result43, result45, result47, result49, result51, result53, result55, result57, result59, result61, result63, result65, result67, result69, result71, result73, result75, result77, result79, result81, result83, result85, result87, result89, result91, result93, result95, result97, result99, result101, result103, result105, result107, result109, result111, result113, result115, result117, result119, result121, result123, result125, result127, result129, result131, result133, result135, result137, result139, result141, result143, result145, result147, result149, result151, result153, result155, result157, result159, result161, result163, result165, result167, result169, result171, result173, result175, result177, result179, result181, result183, result185, result187, result189, result191, result193, result195, result197, result199, result201, result203, result205, result207, result209, result211, result213, result215, result217, result219, result221, result223, result225, result227, result229, result231, result233, result235, result237, result239, result241, result243, result245, result247, result249, result251, result253, result255, result257, result259, result261, result263, result265, result267, result269, result271}; 
String[] resultsder = {result2, result4, result6, result8, result10, result12, result14, result16, result18, result20, result22, result24, result26, result28, result30, result32, result34, result36, result38, result40, result42, result44, result46, result48, result50, result52, result54, result56, result58, result60, result62, result64, result66, result68, result70, result72, result74, result76, result78, result80, result82, result84, result86, result88, result90, result92, result94, result96, result98, result100, result102, result104, result106, result108, result110, result112, result114, result116, result118, result120, result122, result124, result126, result128, result130, result132, result134, result136, result138, result140, result142, result144, result146, result148, result150, result152, result154, result156, result158, result160, result162, result164, result166, result168, result170, result172, result174, result176, result178, result180, result182, result184, result186, result188, result190, result192, result194, result196, result198, result200, result202, result204, result206, result208, result210, result212, result214, result216, result218, result220, result222, result224, result226, result228, result230, result232, result234, result236, result238, result240, result242, result244, result246, result248, result250, result252, result254, result256, result258, result260, result262, result264, result266, result268, result270, result272}; 

    class CustomAdapter extends BaseAdapter{ 

     @Override 
     public int getCount() { 
      return 0; 
     } 

     @Override 
     public Object getItem(int position) { 
      return null; 
     } 

     @Override 
     public long getItemId(int position) { 
      return 0; 
     } 

     @Override 
     public View getView(int position, View view, ViewGroup parent) { 
      view = getLayoutInflater().inflate(R.layout.customlayout,null); 

      TextView resultsiz= (TextView)view.findViewById(R.id.resultsiz); 
      TextView resultsde= (TextView)view.findViewById(R.id.resultsde); 

      resultsiz.setText(resultsizq[position]); 
      resultsde.setText(resultsder[position]); 

      return view; 
     } 
    } 

    @Override 
    protected Void doInBackground(Void... params) { 
     try { 
      Document doc = Jsoup.connect("http://www.rfebs.es/estadisticas/2017/liga/B_res.php").get(); 

      Elements result = doc.getElementsByClass("bianco_me"); 
      if (result.size() > 0) { 
       // get value 
       result1 = result.get(1).text(); 
       result2 = result.get(2).text(); 
       result3 = result.get(3).text(); 
       result4 = result.get(4).text(); 
       result5 = result.get(5).text(); 
       result6 = result.get(6).text(); 
       result7 = result.get(7).text(); 
       result8 = result.get(8).text(); 
       result9 = result.get(9).text(); 
       result10 = result.get(10).text(); 
       result11 = result.get(11).text(); 
       result12 = result.get(12).text(); 
       result13 = result.get(13).text(); 
       result14 = result.get(14).text(); 
       result15 = result.get(15).text(); 
       result16 = result.get(16).text(); 
       result17 = result.get(17).text(); 
       result18 = result.get(18).text(); 
       result19 = result.get(19).text(); 
       result20 = result.get(20).text(); 
       result21 = result.get(21).text(); 
       result22 = result.get(22).text(); 
       result23 = result.get(23).text(); 
       result24 = result.get(24).text(); 
       result25 = result.get(25).text(); 
       result26 = result.get(26).text(); 
       result27 = result.get(27).text(); 
       result28 = result.get(28).text(); 
       result29 = result.get(29).text(); 
       result30 = result.get(30).text(); 
       result31 = result.get(31).text(); 
       result32 = result.get(32).text(); 
       result33 = result.get(33).text(); 
       result34 = result.get(34).text(); 
       result35 = result.get(35).text(); 
       result36 = result.get(36).text(); 
       result37 = result.get(37).text(); 
       result38 = result.get(38).text(); 
       result39 = result.get(39).text(); 
       result40 = result.get(40).text(); 
       result41 = result.get(41).text(); 
       result42 = result.get(42).text(); 
       result43 = result.get(43).text(); 
       result44= result.get(44).text(); 
       result45= result.get(45).text(); 
       result46= result.get(46).text(); 
       result47= result.get(47).text(); 
       result48= result.get(48).text(); 
       result49= result.get(49).text(); 
       result50= result.get(50).text(); 
       result51= result.get(51).text(); 
       result52= result.get(52).text(); 
       result53= result.get(53).text(); 
       result54= result.get(54).text(); 
       result55= result.get(55).text(); 
       result56= result.get(56).text(); 
       result57= result.get(57).text(); 
       result58= result.get(58).text(); 
       result59= result.get(59).text(); 
       result60= result.get(60).text(); 
       result61= result.get(61).text(); 
       ... 
       result197= result.get(197).text(); 
       result198= result.get(198).text(); 
       result199= result.get(199).text(); 
       result200 = result.get(200).text(); 
       result201 = result.get(201).text(); 
       result202 = result.get(202).text(); 
       result203 = result.get(203).text(); 
       result204 = result.get(204).text(); 
       result205 = result.get(205).text(); 
       result206 = result.get(206).text(); 
       result207 = result.get(207).text(); 
       result208 = result.get(208).text(); 
       result209 = result.get(209).text(); 
       result210 = result.get(210).text(); 
       result211= result.get(211).text(); 
       result212= result.get(212).text(); 
       result213= result.get(213).text(); 
       result214= result.get(214).text(); 
       result215= result.get(215).text(); 
       result216= result.get(216).text(); 
       result217= result.get(217).text(); 
       result218= result.get(218).text(); 
       result219= result.get(219).text(); 
       result220= result.get(220).text(); 
       result221= result.get(221).text(); 
       result222= result.get(222).text(); 
       result223= result.get(223).text(); 
       result224= result.get(224).text(); 
       result225= result.get(225).text(); 
       result226= result.get(226).text(); 
       result227= result.get(227).text(); 
       result228= result.get(228).text(); 
       result229= result.get(229).text(); 
       result230= result.get(230).text(); 
       result231= result.get(231).text(); 
       result232= result.get(232).text(); 
       result233= result.get(233).text(); 
       result234= result.get(234).text(); 
       result235= result.get(235).text(); 
       result236= result.get(236).text(); 
       result237= result.get(237).text(); 
       result238= result.get(238).text(); 
       result239= result.get(239).text(); 
       result240= result.get(240).text(); 
       result241= result.get(241).text(); 
       result242= result.get(242).text(); 
       result243= result.get(243).text(); 
       result244= result.get(244).text(); 
       result245= result.get(245).text(); 
       result246= result.get(246).text(); 
       result247= result.get(247).text(); 
       result248= result.get(248).text(); 
       result249= result.get(249).text(); 
       result250= result.get(250).text(); 
       result251= result.get(251).text(); 
       result252= result.get(252).text(); 
       result253= result.get(253).text(); 
       result254= result.get(254).text(); 
       result255= result.get(255).text(); 
       result256= result.get(256).text(); 
       result257= result.get(257).text(); 
       result258= result.get(258).text(); 
       result259= result.get(259).text(); 
       result260= result.get(260).text(); 
       result261= result.get(261).text(); 
       result262= result.get(262).text(); 
       result263= result.get(263).text(); 
       result264= result.get(264).text(); 
       result265= result.get(265).text(); 
       result266= result.get(266).text(); 
       result267= result.get(267).text(); 
       result268= result.get(268).text(); 
       result269= result.get(269).text(); 
       result270= result.get(270).text(); 
       result271= result.get(271).text(); 
       result272= result.get(272).text(); 


      } 


     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
     return null; 
    } 

} 

Debugger:

03/26 18:27:32: Launching app 
$ adb push  /Users/davidgarciaballester/AndroidStudioProjects/BaseballSpain/app/build/outputs/apk/app-debug.apk /data/local/tmp/davidgb.baseballspain 
$ adb shell pm install -r "/data/local/tmp/davidgb.baseballspain" 
Success 


$ adb shell am start -n "davidgb.baseballspain/davidgb.baseballspain.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER -D 
Waiting for application to come online: davidgb.baseballspain.test | davidgb.baseballspain 
Connecting to davidgb.baseballspain 
Connected to the target VM, address: 'localhost:8621', transport: 'socket' 
I/art: Not late-enabling -Xcheck:jni (already on) 
W/art: Unexpected CPU variant for X86 using defaults: x86_64 
W/ActivityThread: Application davidgb.baseballspain is waiting for the debugger on port 8100... 
I/System.out: Sending WAIT chunk 
I/art: Debugger is active 
I/System.out: Debugger has connected 
I/System.out: waiting for debugger to settle... 
I/System.out: waiting for debugger to settle... 
I/System.out: waiting for debugger to settle... 
I/System.out: waiting for debugger to settle... 
I/System.out: waiting for debugger to settle... 
I/System.out: waiting for debugger to settle... 
I/System.out: waiting for debugger to settle... 
I/System.out: waiting for debugger to settle... 
I/System.out: debugger has settled (1465) 
W/System: ClassLoader referenced unknown path: /data/app/davidgb.baseballspain-1/lib/x86_64 
I/InstantRun: Instant Run Runtime started. Android package is  davidgb.baseballspain, real application class is null. 
I/art: Do partial code cache collection, code=28KB, data=22KB 
I/art: After code cache collection, code=19KB, data=18KB 
I/art: Increasing code cache capacity to 128KB 
I/art: Do partial code cache collection, code=57KB, data=43KB 
I/art: After code cache collection, code=52KB, data=41KB 
I/art: Increasing code cache capacity to 256KB 
W/System: ClassLoader referenced unknown path: /data/app/davidgb.baseballspain-1/lib/x86_64 
D/AndroidRuntime: Shutting down VM 


       --------- beginning of crash 
E/AndroidRuntime: FATAL EXCEPTION: main 
       Process: davidgb.baseballspain, PID: 2464 
       java.lang.RuntimeException: Unable to start activity  ComponentInfo{davidgb.baseballspain/davidgb.baseballspain.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference 
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2665) 
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726) 
        at android.app.ActivityThread.-wrap12(ActivityThread.java) 
        at android.app.ActivityThread$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$MethodAndArgsCaller.run(ZygoteInit.java:886) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776) 
       Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference 
        at davidgb.baseballspain.MainActivity.onCreate(MainActivity.java:29) 
        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)  
Disconnected from the target VM, address: 'localhost:8621', transport: 'socket' 

Edit: app nichts zeigen, weil ich nicht die Aktivität Layout in onCreate angegeben hatte.

Answer 1

Der Absturz tritt auf, weil Sie das Aktivitätslayout vor Button but1 = (Button) findViewById(R.id.but); in onCreate nicht angegeben haben.

Beispiel: setContentView(R.layout.activity_main);

Hoffnung, das hilft.

aktualisieren

Ihr individuelles Adapter scheint nicht zu funktionieren, seine statische 0 zurückkehrt, wenn die Gesamtzahl der items..etc bekommen

@Override 
    public int getCount() { 
     return 0; 
    }