空指針異常

我做了Game1.java類，其中有一個對話框，其中有3個選項 - 植物動物，昆蟲。當我對植物的點擊，我們在此得到NullPointerException異常低於線空指針異常

String[] plant_array = getResources().getStringArray(R.array.plant_category); 



my array.xml fine is here 

    <?xml version="1.0" encoding="utf-8"?> 
    <resources> 

<string-array name="category"> 
    <item>Plant</item> 
    <item>Animal</item> 
    <item>Insect</item> 
</string-array> 
<string-array name="plant_category"> 
    <item>VIKASKUMAR</item> 
    <item>SOHAN</item> 
    <item>NARENDRA</item> 
    <item>VISHAL</item> 
    <item>PRASHANT</item> 
    <item>VIJAYAPANDEY</item> 
    <item>SATYA</item> 
    <item>NARAYAN</item> 
    <item>CHOUBEY</item> 
    <item>PRABHA</item> 
</string-array> 
<string-array name="animal_category"> 
    <item>VIKASKUMAR1</item> 
    <item>SOHAN1</item> 
    <item>NARENDRA1</item> 
    <item>VISHAL1</item> 
    <item>PRASHANT1</item> 
    <item>VIJAYAPANDEY1</item> 
    <item>SATYA1</item> 
    <item>NARAYAN1</item> 
    <item>CHOUBEY1</item> 
    <item>PRABHA1</item> 
</string-array> 
<string-array name="insect_category"> 
    <item>VIKASKUMAR2</item> 
    <item>SOHAN2</item> 
    <item>NARENDRA2</item> 
    <item>VISHAL2</item> 
    <item>PRASHANT2</item> 
    <item>VIJAYAPANDEY2</item> 
    <item>SATYA2</item> 
    <item>NARAYAN2</item> 
    <item>CHOUBEY2</item> 
    <item>PRABHA2</item> 
</string-array>

my Game1.java class is here 


    public class Game1 extends Activity implements OnClickListener { 

public static String key; 
private int numwrongguesses; 
private boolean flag = false; 

private static String TAG = "game"; 
private Button abtn, bbtn, cbtn, dbtn, ebtn, fbtn, gbtn, hbtn, ibtn, jbtn, 
     kbtn, lbtn, mbtn, nbtn, obtn, pbtn, qbtn, rbtn, sbtn, tbtn, ubtn, 
     vbtn, wbtn, xbtn, ybtn, zbtn, btnHint; 

private ImageView imageview; 
private TextView mystword, hinttextView; 
static final String KEY_CATEGORY = "com.shagunstudio.hangman.category"; 
private static final int CATEGORY_PLANT = 0; 
private static final int CATEGORY_ANIMAL = 1; 
private static final int CATEGORY_INSECT = 2; 
protected static final int CONTINUE = -1; 
String mysteryWord; 
String hint; 

private int cat; 
int x; 

// ************************************* 
    //HERE NULL POINTER EXCEPTION IS THERE i.e at plant_array[] 

String[] plant_array = getResources().getStringArray(R.array.plant_category); 
String[] plant_array_hint = getResources().getStringArray(R.array.plant_category_hint); 

// *********************************** 

String[] animal_array = getResources().getStringArray(R.array.animal_category); 
String[] animal_array_hint = getResources().getStringArray(
     R.array.animal_category_hint); 

// *************************************************************** 

String[] insect_array = getResources().getStringArray(
     R.array.insect_category); 
String[] insect_array_hint = getResources().getStringArray(
     R.array.insect_category_hint); 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    // TODO Auto-generated method stub 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.game); 
    imageview = (ImageView) findViewById(R.id.hangmanimageview); 
    abtn = (Button) findViewById(R.id.A_BUTTON); 
    abtn.setOnClickListener(this); 

    bbtn = (Button) findViewById(R.id.B_BUTTON); 
    bbtn.setOnClickListener(this); 

    cbtn = (Button) findViewById(R.id.C_BUTTON); 
    cbtn.setOnClickListener(this); 

    dbtn = (Button) findViewById(R.id.D_BUTTON); 
    dbtn.setOnClickListener(this); 

    ebtn = (Button) findViewById(R.id.E_BUTTON); 
    ebtn.setOnClickListener(this); 

    fbtn = (Button) findViewById(R.id.F_BUTTON); 
    fbtn.setOnClickListener(this); 

    gbtn = (Button) findViewById(R.id.G_BUTTON); 
    gbtn.setOnClickListener(this); 

    hbtn = (Button) findViewById(R.id.H_BUTTON); 
    hbtn.setOnClickListener(this); 

    ibtn = (Button) findViewById(R.id.I_BUTTON); 
    ibtn.setOnClickListener(this); 

    jbtn = (Button) findViewById(R.id.J_BUTTON); 
    jbtn.setOnClickListener(this); 

    kbtn = (Button) findViewById(R.id.K_BUTTON); 
    kbtn.setOnClickListener(this); 

    lbtn = (Button) findViewById(R.id.L_BUTTON); 
    lbtn.setOnClickListener(this); 

    mbtn = (Button) findViewById(R.id.M_BUTTON); 
    mbtn.setOnClickListener(this); 

    nbtn = (Button) findViewById(R.id.N_BUTTON); 
    nbtn.setOnClickListener(this); 

    obtn = (Button) findViewById(R.id.O_BUTTON); 
    obtn.setOnClickListener(this); 

    pbtn = (Button) findViewById(R.id.P_BUTTON); 
    pbtn.setOnClickListener(this); 

    qbtn = (Button) findViewById(R.id.Q_BUTTON); 
    qbtn.setOnClickListener(this); 

    rbtn = (Button) findViewById(R.id.R_BUTTON); 
    rbtn.setOnClickListener(this); 

    sbtn = (Button) findViewById(R.id.S_BUTTON); 
    sbtn.setOnClickListener(this); 

    tbtn = (Button) findViewById(R.id.T_BUTTON); 
    tbtn.setOnClickListener(this); 
    ubtn = (Button) findViewById(R.id.U_BUTTON); 
    ubtn.setOnClickListener(this); 

    vbtn = (Button) findViewById(R.id.V_BUTTON); 
    vbtn.setOnClickListener(this); 

    wbtn = (Button) findViewById(R.id.W_BUTTON); 
    wbtn.setOnClickListener(this); 

    xbtn = (Button) findViewById(R.id.X_BUTTON); 
    xbtn.setOnClickListener(this); 

    ybtn = (Button) findViewById(R.id.Y_BUTTON); 
    ybtn.setOnClickListener(this); 

    zbtn = (Button) findViewById(R.id.Z_BUTTON); 
    zbtn.setOnClickListener(this); 

    btnHint = (Button) findViewById(R.id.HINT_BUTTON); 
    btnHint.setOnClickListener(this); 

    Intent intent = getIntent(); 
    Bundle bundle = intent.getExtras(); 
    int category = bundle.getInt(KEY_CATEGORY); 
    // bundle.putInt(key, CATEGORY_PLANT); 
    mysteryWord = getGameByCategory(category); 

    Intent i = getIntent(); 
    Bundle b = i.getExtras(); 
    // int c = b.getInt(key); 
    b.putInt(KEY_CATEGORY, CONTINUE); 

    mystword = (TextView) findViewById(R.id.textviewhangman); 
    hinttextView = (TextView) findViewById(R.id.hinttextView1); 

    initMystWord(); 

} 

@Override 
protected void onPause() { 
    super.onPause(); 

} 

@Override 
public void onClick(View v) { 
    switch (v.getId()) { 

    case R.id.A_BUTTON: 
     flag = false; 
     updateMystWord('A'); 
     break; 
    case R.id.B_BUTTON: 
     flag = false; 
     updateMystWord('B'); 
     break; 
    case R.id.C_BUTTON: 
     flag = false; 
     updateMystWord('C'); 
     break; 
    case R.id.D_BUTTON: 
     flag = false; 
     updateMystWord('D'); 
     break; 
    case R.id.E_BUTTON: 
     flag = false; 
     updateMystWord('E'); 
     break; 
    case R.id.F_BUTTON: 
     flag = false; 
     updateMystWord('F'); 
     break; 
    case R.id.G_BUTTON: 
     flag = false; 
     updateMystWord('G'); 
     break; 
    case R.id.H_BUTTON: 
     flag = false; 
     updateMystWord('H'); 
     break; 
    case R.id.I_BUTTON: 
     flag = false; 
     updateMystWord('I'); 
     break; 
    case R.id.J_BUTTON: 
     flag = false; 
     updateMystWord('J'); 
     break; 
    case R.id.K_BUTTON: 
     flag = false; 
     updateMystWord('K'); 
     break; 
    case R.id.L_BUTTON: 
     flag = false; 
     updateMystWord('L'); 
     break; 
    case R.id.M_BUTTON: 
     flag = false; 
     updateMystWord('M'); 
     break; 
    case R.id.N_BUTTON: 
     flag = false; 
     updateMystWord('N'); 
     break; 
    case R.id.O_BUTTON: 
     flag = false; 
     updateMystWord('O'); 
     break; 
    case R.id.P_BUTTON: 
     flag = false; 
     updateMystWord('P'); 
     break; 
    case R.id.Q_BUTTON: 
     flag = false; 
     updateMystWord('Q'); 
     break; 
    case R.id.R_BUTTON: 
     flag = false; 
     updateMystWord('R'); 
     break; 
    case R.id.S_BUTTON: 
     flag = false; 
     updateMystWord('S'); 
     break; 
    case R.id.T_BUTTON: 
     flag = false; 
     updateMystWord('T'); 
     break; 
    case R.id.U_BUTTON: 
     flag = false; 
     updateMystWord('U'); 
     break; 
    case R.id.V_BUTTON: 
     flag = false; 
     updateMystWord('V'); 
     break; 
    case R.id.W_BUTTON: 
     flag = false; 
     updateMystWord('W'); 
     break; 
    case R.id.X_BUTTON: 
     flag = false; 
     updateMystWord('X'); 
     break; 
    case R.id.Y_BUTTON: 
     flag = false; 
     updateMystWord('Y'); 
     break; 
    case R.id.Z_BUTTON: 
     flag = false; 
     updateMystWord('Z'); 
     break; 
    case R.id.HINT_BUTTON: 
     flag = false; 
     useHint(); 
     break; 

    } 

} 

public String underscore() { 
    StringBuffer buffer = new StringBuffer(); 

    Log.d(TAG, "nameof musteryword is =" + mysteryWord); 
    for (int i = 0; i < mysteryWord.length(); i++) { 
     Log.d(TAG, "length of musteryword is =" + mysteryWord.length()); 
     buffer.append("_ "); 
    } 
    return buffer.toString(); 
} 

public void initMystWord() { 
    mystword.setText(underscore()); 

} 


private String getGameByCategory(int category) { 
    String temp = null; 
    switch (cat) { 
    case CATEGORY_PLANT: 
     Random random1 = new Random(); 
     x = random1.nextInt(5); 
     mysteryWord = plant_array[x]; 
     //hint = plant_array_hint[x]; 
     temp = mysteryWord; 
     break; 
    case CATEGORY_ANIMAL: 
     Random random2 = new Random(); 
     x = random2.nextInt(5); 
     mysteryWord = animal_array[x]; 
     //hint = animal_array_hint[x]; 
     temp = mysteryWord; 
     break; 
    case CATEGORY_INSECT: 
     Random random3 = new Random(); 
     x = random3.nextInt(5); 
     mysteryWord = insect_array[x]; 
     //hint = insect_array_hint[x]; 
     temp = mysteryWord; 
     break; 
    } 
    return temp; 
}

}

我們得到了空指針異常的錯誤，當我們調試這個節目源沒有發現顯示 deguger也無法正常工作....請給我回復先生..我會他非常感謝你的滿意哦

來源

2013-02-25 vikas kumar choubey

您的array.xml存儲在哪個文件夾中？ – 2013-02-25 10:15:19

發佈logcat outpt太 – 2013-02-25 10:15:26

我得到了這個問題的答案..自己 – 2013-02-25 13:10:53

getResources()要求Context這將是null'，直到至少onCreate方法。請將所有相應的String[]移至`onCreate方法，看看它是否有所作爲。

來源

2013-02-25 10:31:21 mango

我非常感謝你滿@芒果 – 2013-02-26 07:53:31

回答

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