Finde Fehler im Quellcode trotz Debuggingausgabe meiner ersten AndroidApp nicht [Anfänger]

101-21 18:19:58.926 17908-17908/de.lucas.clickgame.firstapp E/AndroidRuntime﹕ FATAL EXCEPTION: main
2 Process: de.lucas.clickgame.firstapp, PID: 17908
3 java.lang.RuntimeException: Unable to start activity ComponentInfo{de.lucas.clickgame.firstapp/de.lucas.clickgame.firstapp.MainActivity}: java.lang.NullPointerException
4 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
5 at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
6 at android.app.ActivityThread.access$800(ActivityThread.java:135)
7 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
8 at android.os.Handler.dispatchMessage(Handler.java:102)
9 at android.os.Looper.loop(Looper.java:136)
10 at android.app.ActivityThread.main(ActivityThread.java:5017)
11 at java.lang.reflect.Method.invokeNative(Native Method)
12 at java.lang.reflect.Method.invoke(Method.java:515)
13 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
14 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
15 at dalvik.system.NativeStart.main(Native Method)
16 Caused by: java.lang.NullPointerException
17 at de.lucas.clickgame.firstapp.MainActivity.onCreate(MainActivity.java:31)
18 at android.app.Activity.performCreate(Activity.java:5231)
19 at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
20 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
21 at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
22 at android.app.ActivityThread.access$800(ActivityThread.java:135)
23 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
24 at android.os.Handler.dispatchMessage(Handler.java:102)
25 at android.os.Looper.loop(Looper.java:136)
26 at android.app.ActivityThread.main(ActivityThread.java:5017)
27 at java.lang.reflect.Method.invokeNative(Native Method)
28 at java.lang.reflect.Method.invoke(Method.java:515)
29 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
30 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
31 at dalvik.system.NativeStart.main(Native Method)

1at de.lucas.clickgame.firstapp.MainActivity.onCreate(MainActivity.java:31)

1package de.lucas.clickgame.firstapp;
2
3import android.app.AlertDialog;
4import android.support.v7.app.ActionBarActivity;
5import android.support.v7.app.ActionBar;
6import android.support.v4.app.Fragment;
7import android.os.Bundle;
8import android.view.LayoutInflater;
9import android.view.Menu;
10import android.view.MenuItem;
11import android.view.View;
12import android.view.ViewGroup;
13import android.os.Build;
14import android.os.Bundle;
15import android.widget.ProgressBar;
16import android.widget.Button;
17
18public class MainActivity extends ActionBarActivity implements View.OnClickListener {
19
20 ProgressBar bar;
21 Button btn;
22 int i = 1;
23
24
25 @Override
26 protected void onCreate(Bundle savedInstanceState) {
27 super.onCreate(savedInstanceState);
28 setContentView(R.layout.activity_main);
29
30 bar = (ProgressBar)findViewById(R.id.progressBar);
31 bar.setMax(100);
32
33 btn = (Button)findViewById(R.id.button);
34 btn.setOnClickListener(this);
35
36 if (savedInstanceState == null) {
37 getSupportFragmentManager().beginTransaction()
38 .add(R.id.container, new PlaceholderFragment())
39 .commit();
40 }
41 }
42
43 public void onClick(View e){
44 if(e == btn){
45 i += 4;
46 if(i>=100){
47 AlertDialog ad = new AlertDialog.Builder(this).create();
48 ad.setMessage("Du hast gewonnen!!!");
49 ad.show();
50
51 i=0;
52 }
53 bar.setProgress(i);
54 }
55 }
56
57
58 @Override
59 public boolean onCreateOptionsMenu(Menu menu) {
60
61 // Inflate the menu; this adds items to the action bar if it is present.
62 getMenuInflater().inflate(R.menu.main, menu);
63 return true;
64 }
65
66 @Override
67 public boolean onOptionsItemSelected(MenuItem item) {
68 // Handle action bar item clicks here. The action bar will
69 // automatically handle clicks on the Home/Up button, so long
70 // as you specify a parent activity in AndroidManifest.xml.
71 int id = item.getItemId();
72 if (id == R.id.action_settings) {
73 return true;
74 }
75 return super.onOptionsItemSelected(item);
76 }
77
78 /**
79 * A placeholder fragment containing a simple view.
80 */
81 public static class PlaceholderFragment extends Fragment {
82
83 public PlaceholderFragment() {
84 }
85
86 @Override
87 public View onCreateView(LayoutInflater inflater, ViewGroup container,
88 Bundle savedInstanceState) {
89 View rootView = inflater.inflate(R.layout.fragment_main, container, false);
90 return rootView;
91 }
92 }
93
94}

1bar = (ProgressBar)findViewById(R.id.progressBar)
2 bar.setMax(100);
3
4 btn = (Button)findViewById(R.id.button);
5 btn.setOnClickListener(this);

1public void onClick(View e){
2 if(e == btn){
3 i += 4;
4 if(i>=100){
5 AlertDialog ad = new AlertDialog.Builder(this).create();
6 ad.setMessage("Du hast gewonnen!!!");
7 ad.show();
8
9 i=0;
10 }
11 bar.setProgress(i);
12 }
13 }

1<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
2 xmlns:tools="http://schemas.android.com/tools"
3 android:layout_width="match_parent"
4 android:layout_height="match_parent"
5 android:paddingLeft="@dimen/activity_horizontal_margin"
6 android:paddingRight="@dimen/activity_horizontal_margin"
7 android:paddingTop="@dimen/activity_vertical_margin"
8 android:paddingBottom="@dimen/activity_vertical_margin"
9 tools:context="de.lucas.clickgame.firstapp.MainActivity$PlaceholderFragment">
10
11 <Button
12 android:layout_width="wrap_content"
13 android:layout_height="wrap_content"
14 android:text="@string/button"
15 android:id="@+id/button"
16 android:layout_alignParentTop="true"
17 android:layout_alignParentLeft="true"
18 android:layout_alignParentStart="true"
19 android:layout_alignParentRight="true"
20 android:layout_alignParentEnd="true" />
21
22 <ProgressBar
23 style="?android:attr/progressBarStyleHorizontal"
24 android:layout_width="wrap_content"
25 android:layout_height="wrap_content"
26 android:id="@+id/progressBar"
27 android:layout_below="@+id/button"
28 android:layout_alignParentLeft="true"
29 android:layout_alignParentStart="true"
30 android:layout_alignParentRight="true"
31 android:layout_alignParentEnd="true"
32 android:minHeight="40dp" />
33</RelativeLayout>