大家好我是android的新手，请帮帮我。我想开始＆＃34; OyunActivity＆＃34;来自＆＃34; LevelActivity＆＃34;在我的项目中。但是出现了以下错误：
06-19 01:02:43.670: E/AndroidRuntime(26550): FATAL EXCEPTION: main
06-19 01:02:43.670: E/AndroidRuntime(26550): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.hangdeneme/com.example.hangdeneme.OyunActivity}: java.lang.NullPointerException
06-19 01:02:43.670: E/AndroidRuntime(26550): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2024)
06-19 01:02:43.670: E/AndroidRuntime(26550): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2125)
06-19 01:02:43.670: E/AndroidRuntime(26550): at android.app.ActivityThread.access$600(ActivityThread.java:140)
06-19 01:02:43.670: E/AndroidRuntime(26550): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1227)
06-19 01:02:43.670: E/AndroidRuntime(26550): at android.os.Handler.dispatchMessage(Handler.java:99)
06-19 01:02:43.670: E/AndroidRuntime(26550): at android.os.Looper.loop(Looper.java:137)
06-19 01:02:43.670: E/AndroidRuntime(26550): at android.app.ActivityThread.main(ActivityThread.java:4898)
06-19 01:02:43.670: E/AndroidRuntime(26550): at java.lang.reflect.Method.invokeNative(Native Method)
06-19 01:02:43.670: E/AndroidRuntime(26550): at java.lang.reflect.Method.invoke(Method.java:511)
06-19 01:02:43.670: E/AndroidRuntime(26550): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006)
06-19 01:02:43.670: E/AndroidRuntime(26550): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)
06-19 01:02:43.670: E/AndroidRuntime(26550): at dalvik.system.NativeStart.main(Native Method)
06-19 01:02:43.670: E/AndroidRuntime(26550): Caused by: java.lang.NullPointerException
06-19 01:02:43.670: E/AndroidRuntime(26550): at android.content.ContextWrapper.getSharedPreferences(ContextWrapper.java:160)
06-19 01:02:43.670: E/AndroidRuntime(26550): at com.example.hangdeneme.OyunActivity.<init>(OyunActivity.java:34)
06-19 01:02:43.670: E/AndroidRuntime(26550): at java.lang.Class.newInstanceImpl(Native Method)
06-19 01:02:43.670: E/AndroidRuntime(26550): at java.lang.Class.newInstance(Class.java:1319)
06-19 01:02:43.670: E/AndroidRuntime(26550): at android.app.Instrumentation.newActivity(Instrumentation.java:1057)
06-19 01:02:43.670: E/AndroidRuntime(26550): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2015)
06-19 01:02:43.670: E/AndroidRuntime(26550): ... 11 more
我将所有活动添加到AndroidManifest.xml中就像这样： Android Manifest.xml
<activity
android:name="com.example.hangdeneme.LevelActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.LevelActivity" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name="com.example.hangdeneme.OyunActivity"
android:label="@string/title_activity_oyun" >
<intent-filter>
<action android:name="android.intent.action.OyunActivity" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
我尝试通过在java构建路径上添加库来解决问题，但它不起作用。 有人认为这是由日食引起的问题，但我不知道。 无论如何，在项目我的LevelActivity.java是那个，如果有问题，我认为它在这里：
package com.example.hangdeneme;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class LevelActivity extends Activity {
public static String KATEGORI_NU="";
int kategoriNu=0;
ListView lisViewKategori;
String kategori[]={"bitki","hayvan","özel","şehir","film","müzik","marka","falan-filan"};
MainMenuActivity mma= new MainMenuActivity();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_level);
ArrayAdapter<String> adapterKategori = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,kategori);
lisViewKategori = (ListView) findViewById(R.id.listView1);
lisViewKategori.setAdapter(adapterKategori);
lisViewKategori.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
kategoriNu=arg2;
Intent intent= new Intent(LevelActivity.this,OyunActivity.class);
intent.putExtra(KATEGORI_NU, kategoriNu);
mma.menuMedia.pause();
startActivity(intent);
finish();
}
});
}
}
和OyunActivity.java就是这样 - 我不认为这里可能有问题 - ：
package com.example.hangdeneme;
import java.util.ArrayList;
import java.util.Random;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.Vibrator;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
public class OyunActivity extends Activity implements OnClickListener{
Button buttonA,buttonB,buttonC,buttonC2,buttonD,buttonE,buttonF,buttonG,buttonG2,buttonH,buttonI,buttonI2,buttonJ,buttonK,buttonL;
Button buttonM,buttonN,buttonO,buttonO2,buttonP,buttonR,buttonS,buttonS2,buttonT,buttonU,buttonU2,buttonV,buttonY,buttonZ;
static ImageView hangmanImage;
TextView textViewHata;
TextView textViewSonuc;
MainMenuActivity mma= new MainMenuActivity();
MediaPlayer butonses;
private Vibrator vib;
SharedPreferences preference = getSharedPreferences("TERCİHLER", MODE_PRIVATE);
private static final String PREF_TITRESIM="PREF_TITRESIM";
private static final String PREF_SES="PREF_SES";
KelimeKutuphane kk= new KelimeKutuphane();
char[] mHarfler={};
static int hataSayisi=0,oyunKontrol=0,levelNu=1,kategoriNu=0,levelDurum=0;
static final int KAZANDINIZ=0,KAYBETTİNİZ=1;
String kelime="";
ArrayList<TextView> harf = new ArrayList<TextView>();
Intent intent = new Intent();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_oyun);
vib=(Vibrator) getSystemService(VIBRATOR_SERVICE);
buttonA = (Button) findViewById(R.id.buttonA);
buttonB = (Button) findViewById(R.id.buttonB);
buttonC = (Button) findViewById(R.id.buttonC);
buttonC2 = (Button) findViewById(R.id.buttonC2);
buttonD = (Button) findViewById(R.id.buttonD);
buttonE = (Button) findViewById(R.id.buttonE);
buttonF = (Button) findViewById(R.id.buttonF);
buttonG = (Button) findViewById(R.id.buttonG);
buttonG2 = (Button) findViewById(R.id.buttonG2);
buttonH = (Button) findViewById(R.id.buttonH);
buttonI = (Button) findViewById(R.id.buttonI);
buttonI2 = (Button) findViewById(R.id.buttonI2);
buttonJ = (Button) findViewById(R.id.buttonJ);
buttonK = (Button) findViewById(R.id.buttonK);
buttonL = (Button) findViewById(R.id.buttonL);
buttonM = (Button) findViewById(R.id.buttonM);
buttonN = (Button) findViewById(R.id.buttonN);
buttonO = (Button) findViewById(R.id.buttonO);
buttonO2 = (Button) findViewById(R.id.buttonO2);
buttonP = (Button) findViewById(R.id.buttonP);
buttonR = (Button) findViewById(R.id.buttonR);
buttonS = (Button) findViewById(R.id.buttonS);
buttonS2 = (Button) findViewById(R.id.buttonS2);
buttonT = (Button) findViewById(R.id.buttonT);
buttonU = (Button) findViewById(R.id.buttonU);
buttonU2 = (Button) findViewById(R.id.buttonU2);
buttonV = (Button) findViewById(R.id.buttonV);
buttonY = (Button) findViewById(R.id.buttonY);
buttonZ = (Button) findViewById(R.id.buttonZ);
buttonA.setOnClickListener(this);
buttonB.setOnClickListener(this);
buttonC.setOnClickListener(this);
buttonC2.setOnClickListener(this);
buttonD.setOnClickListener(this);
buttonE.setOnClickListener(this);
buttonF.setOnClickListener(this);
buttonG.setOnClickListener(this);
buttonG2.setOnClickListener(this);
buttonH.setOnClickListener(this);
buttonI.setOnClickListener(this);
buttonI2.setOnClickListener(this);
buttonJ.setOnClickListener(this);
buttonK.setOnClickListener(this);
buttonL.setOnClickListener(this);
buttonM.setOnClickListener(this);
buttonN.setOnClickListener(this);
buttonO.setOnClickListener(this);
buttonO2.setOnClickListener(this);
buttonP.setOnClickListener(this);
buttonR.setOnClickListener(this);
buttonS.setOnClickListener(this);
buttonS2.setOnClickListener(this);
buttonT.setOnClickListener(this);
buttonU.setOnClickListener(this);
buttonU2.setOnClickListener(this);
buttonV.setOnClickListener(this);
buttonY.setOnClickListener(this);
buttonZ.setOnClickListener(this);
textViewHata = (TextView) findViewById(R.id.textViewHata);
textViewSonuc= (TextView) findViewById(R.id.textViewSonuc);
hangmanImage = (ImageView) findViewById(R.id.hangmanImage);
new MediaPlayer();
butonses = MediaPlayer.create(OyunActivity.this, R.raw.button);
kelime= getKelime();
Adapter(kelime);
}
public String getKelime(){
Intent intent = getIntent();
kategoriNu=intent.getIntExtra(LevelActivity.KATEGORI_NU, 2);
int random;
Random r= new Random();
random=r.nextInt(2);
switch (levelNu) {
case 1:
kelime= kk.dizi1[kategoriNu][random];
break;
case 2:
kelime= kk.dizi2[kategoriNu][random];
break;
case 3:
kelime= kk.dizi3[kategoriNu][random];
break;
case 4:
kelime= kk.dizi4[kategoriNu][random];
break;
case 5:
kelime= kk.dizi5[kategoriNu][random];
break;
case 6:
kelime= kk.dizi6[kategoriNu][random];
break;
case 7:
kelime= kk.dizi7[kategoriNu][random];
break;
case 8:
kelime= kk.dizi8[kategoriNu][random];
break;
case 9:
kelime= kk.dizi9[kategoriNu][random];
break;
case 10:
kelime= kk.dizi10[kategoriNu][random];
break;
default:
break;
}
return kelime;
}
public void Adapter(String kelime){
String mKelime = kelime;
LinearLayout layout = (LinearLayout) findViewById(R.id.linearLayout);
LinearLayout layout2 = (LinearLayout) findViewById(R.id.linearLayout2);
mHarfler = mKelime.toCharArray();
LayoutInflater mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View wordView[] = new View[mHarfler.length];
for(int i = 0 ; i<mHarfler.length ; i++){
wordView[i] = mInflater.inflate(R.layout.a_letter_of_word, null);
TextView tv = (TextView) wordView[i].findViewById(R.id.letterText);
harf.add(tv);
harf.get(i).setText(mHarfler, i, 1);
harf.get(i).setVisibility(android.view.View.INVISIBLE);
if(i<9)
layout.addView(wordView[i]);
else
layout2.addView(wordView[i]);
}}
@SuppressWarnings("deprecation")
public void SearchFor(char letter){
int i,j=0;
if(hataSayisi<5&&oyunKontrol<mHarfler.length){
for(i=0;i<=(mHarfler.length-1);i++){
if(mHarfler[i]==letter){
harf.get(i).setVisibility(android.view.View.VISIBLE);
j=j+1;
oyunKontrol=oyunKontrol+1;
}
}
if(j==0){
hataSayisi=hataSayisi+1;
textViewHata.setText("5 hata hakkınız vardır: Hata sayısı : "+hataSayisi);
setHangImage(hataSayisi);
}}
else{
if(oyunKontrol==mHarfler.length)
{textViewSonuc.setText("OYUN BİTTİ : KAZANDINIZ");
showDialog(KAZANDINIZ);
oyunKontrol=0;
hataSayisi=0;
if(levelDurum<5)
levelDurum=levelDurum+1;
else{
levelDurum=1;
levelNu=levelNu+1;
}
}
if(hataSayisi==5)
{textViewSonuc.setText("OYUN BİTTİ : KAYBETTİNİZ");
showDialog(KAYBETTİNİZ);
hataSayisi=0;
oyunKontrol=0;}
}}
@Override
public void onClick(View v) {
boolean btnses = preference.getBoolean(PREF_SES, true);
boolean titresim= preference.getBoolean(PREF_TITRESIM, true);
try{
if(kelime!="")
switch (v.getId()) {
case R.id.buttonA:
buttonA.setVisibility(android.view.View.INVISIBLE);
if(titresim)
vib.vibrate(400);
if(btnses)
butonses.start();
SearchFor('a');
break;
case R.id.buttonB:
buttonB.setVisibility(android.view.View.INVISIBLE);
if(titresim)
vib.vibrate(400);
if(btnses)
butonses.start();
SearchFor('b');
break;
case R.id.buttonC:
buttonC.setVisibility(android.view.View.INVISIBLE);
if(titresim)
vib.vibrate(400);
if(btnses)
butonses.start();
SearchFor('c');
break;
case R.id.buttonC2:
buttonC2.setVisibility(android.view.View.INVISIBLE);
if(titresim)
vib.vibrate(400);
if(btnses)
butonses.start();
SearchFor('ç');
break;
case R.id.buttonD:
buttonD.setVisibility(android.view.View.INVISIBLE);
if(titresim)
vib.vibrate(400);
if(btnses)
butonses.start();
SearchFor('d');
break;
case R.id.buttonE:
buttonE.setVisibility(android.view.View.INVISIBLE);
if(titresim)
vib.vibrate(400);
if(btnses)
butonses.start();
SearchFor('e');
break;
case R.id.buttonF:
buttonF.setVisibility(android.view.View.INVISIBLE);
if(titresim)
vib.vibrate(400);
if(btnses)
butonses.start();
SearchFor('f');
break;
case R.id.buttonG:
buttonG.setVisibility(android.view.View.INVISIBLE);
if(titresim)
vib.vibrate(400);
if(btnses)
butonses.start();
SearchFor('g');
break;
case R.id.buttonG2:
buttonG2.setVisibility(android.view.View.INVISIBLE);
if(titresim)
vib.vibrate(400);
if(btnses)
butonses.start();
SearchFor('ğ');
break;
case R.id.buttonH:
buttonH.setVisibility(android.view.View.INVISIBLE);
if(titresim)
vib.vibrate(400);
if(btnses)
butonses.start();
SearchFor('h');
break;
case R.id.buttonI:
buttonI.setVisibility(android.view.View.INVISIBLE);
if(titresim)
vib.vibrate(400);
if(btnses)
butonses.start();
SearchFor('ı');
break;
case R.id.buttonI2:
buttonI2.setVisibility(android.view.View.INVISIBLE);
if(titresim)
vib.vibrate(400);
if(btnses)
butonses.start();
SearchFor('i');
break;
case R.id.buttonJ:
buttonJ.setVisibility(android.view.View.INVISIBLE);
if(titresim)
vib.vibrate(400);
if(btnses)
butonses.start();
SearchFor('j');
break;
case R.id.buttonK:
buttonK.setVisibility(android.view.View.INVISIBLE);
if(titresim)
vib.vibrate(400);
if(btnses)
butonses.start();
SearchFor('k');
break;
case R.id.buttonL:
buttonL.setVisibility(android.view.View.INVISIBLE);
if(titresim)
vib.vibrate(400);
if(btnses)
butonses.start();
SearchFor('l');
break;
case R.id.buttonM:
buttonM.setVisibility(android.view.View.INVISIBLE);
if(titresim)
vib.vibrate(400);
if(btnses)
butonses.start();
SearchFor('m');
break;
case R.id.buttonN:
buttonN.setVisibility(android.view.View.INVISIBLE);
if(titresim)
vib.vibrate(400);
if(btnses)
butonses.start();
SearchFor('n');
break;
case R.id.buttonO:
buttonO.setVisibility(android.view.View.INVISIBLE);
if(titresim)
vib.vibrate(400);
if(btnses)
butonses.start();
SearchFor('o');
break;
case R.id.buttonO2:
buttonO2.setVisibility(android.view.View.INVISIBLE);
if(titresim)
vib.vibrate(400);
if(btnses)
butonses.start();
SearchFor('ö');
break;
case R.id.buttonP:
buttonP.setVisibility(android.view.View.INVISIBLE);
if(titresim)
vib.vibrate(400);
if(btnses)
butonses.start();
SearchFor('p');
break;
case R.id.buttonR:
buttonR.setVisibility(android.view.View.INVISIBLE);
if(titresim)
vib.vibrate(400);
if(btnses)
butonses.start();
SearchFor('r');
break;
case R.id.buttonS:
buttonS.setVisibility(android.view.View.INVISIBLE);
if(titresim)
vib.vibrate(400);
if(btnses)
butonses.start();
SearchFor('s');
break;
case R.id.buttonS2:
buttonS2.setVisibility(android.view.View.INVISIBLE);
if(titresim)
vib.vibrate(400);
if(btnses)
butonses.start();
SearchFor('ş');
break;
case R.id.buttonT:
buttonT.setVisibility(android.view.View.INVISIBLE);
if(titresim)
vib.vibrate(400);
if(btnses)
butonses.start();
SearchFor('t');
break;
case R.id.buttonU:
buttonU.setVisibility(android.view.View.INVISIBLE);
if(titresim)
vib.vibrate(400);
if(btnses)
butonses.start();
SearchFor('u');
break;
case R.id.buttonU2:
buttonU2.setVisibility(android.view.View.INVISIBLE);
if(titresim)
vib.vibrate(400);
if(btnses)
butonses.start();
SearchFor('ü');
break;
case R.id.buttonV:
buttonV.setVisibility(android.view.View.INVISIBLE);
if(titresim)
vib.vibrate(400);
if(btnses)
butonses.start();
SearchFor('v');
break;
case R.id.buttonY:
buttonY.setVisibility(android.view.View.INVISIBLE);
if(titresim)
vib.vibrate(400);
if(btnses)
butonses.start();
SearchFor('y');
break;
case R.id.buttonZ:
buttonZ.setVisibility(android.view.View.INVISIBLE);
if(titresim)
vib.vibrate(400);
if(btnses)
butonses.start();
SearchFor('z');
break;
default:
break;
}
else
Toast.makeText(getApplicationContext(), "soru kelime henüz hazır değil", Toast.LENGTH_SHORT).show();
}
catch(Exception e){
}}
public static void setHangImage(int hataSayisi){
switch (hataSayisi) {
case 1:
hangmanImage.setImageResource(R.drawable.hangimage_bir);
break;
case 2:
hangmanImage.setImageResource(R.drawable.hangimage_iki);
break;
case 3:
hangmanImage.setImageResource(R.drawable.hangimage_uc);
break;
case 4:
hangmanImage.setImageResource(R.drawable.hangimage_dort);
break;
case 5:
hangmanImage.setImageResource(R.drawable.hangimage_bes);
break;
default:
break;
}
}
@Override
@Deprecated
protected Dialog onCreateDialog(int id) {
Dialog dialog;
switch (id) {
case KAZANDINIZ:
dialog= getDialog(KAZANDINIZ);
break;
case KAYBETTİNİZ:
dialog= getDialog(KAYBETTİNİZ);
break;
default:
dialog=null;
break;
}
return dialog;
}
private Dialog getDialog(int id){
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("HangMan");
switch (id) {
case KAZANDINIZ:
builder.setMessage("KAZANDINIZ");
builder.setPositiveButton("Devam Et",new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
getKelime();
}
});
builder.setNegativeButton("Ana Menü",new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Intent intent = new Intent(OyunActivity.this,MainMenuActivity.class);
mma.menuMedia.start();
startActivity(intent);
}
});
break;
case KAYBETTİNİZ:
builder.setMessage("KAYBETTİNİZ");
builder.setPositiveButton("Yeni Oyun",new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
intent.setAction("android.intent.action.LevelActivity");
startActivity(intent);
}
});
builder.setNegativeButton("Ana Menü",new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Intent intent = new Intent(OyunActivity.this,MainMenuActivity.class);
mma.menuMedia.start();
startActivity(intent);
}
});
break;
}
builder.setCancelable(false);
return builder.create();
}
}
答案 0 :(得分：0)
您无法在Activity ...
SharedPreferences preference = getSharedPreferences("TERCİHLER", MODE_PRIVATE);
将其声明为
SharedPreferences preference;
...然后在onCreate(...)获取首选项...
preference = getSharedPreferences("TERCİHLER", MODE_PRIVATE);
另一点是永远不要这样做......
MainMenuActivity mma= new MainMenuActivity();
...您无法使用Activity创建new的实例。它根本行不通。不要尝试它，也不要在public中创建Activity方法或变量，并希望它们有效。