理由はnull pointer exceptionsわかりませんが、以下のこのコードは基本的なコードにすぎませんが、画像の1つをクリックするとすぐに何かがヌルポインタ例外を引き起こしています
public class MainActivity extends Activity implements OnClickListener{
ImageView img1,img2,img3,img4,img5,img6,img7,img8,img9;
int i = 0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ImageView img1 = (ImageView) findViewById(R.id.ImageView01);
ImageView img2 = (ImageView) findViewById(R.id.ImageView02);
ImageView img3 = (ImageView) findViewById(R.id.ImageView03);
ImageView img4 = (ImageView) findViewById(R.id.ImageView04);
ImageView img5 = (ImageView) findViewById(R.id.ImageView05);
ImageView img6 = (ImageView) findViewById(R.id.ImageView06);
ImageView img7 = (ImageView) findViewById(R.id.ImageView07);
ImageView img8 = (ImageView) findViewById(R.id.ImageView08);
ImageView img9 = (ImageView) findViewById(R.id.ImageView09);
img1.setOnClickListener(this);
img2.setOnClickListener(this);
img3.setOnClickListener(this);
img4.setOnClickListener(this);
img5.setOnClickListener(this);
img6.setOnClickListener(this);
img7.setOnClickListener(this);
img8.setOnClickListener(this);
img9.setOnClickListener(this);
if(i == 8){
//show dialog
Toast.makeText(getApplicationContext(), "You clicked all 9", Toast.LENGTH_LONG).show();
}
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.ImageView01:
// do something
img1.setVisibility(View.GONE);
i = i + 1;
break;
case R.id.ImageView02:
// do something
img2.setVisibility(View.GONE);
i = i + 1;
break;
case R.id.ImageView03:
// do something
img3.setVisibility(View.GONE);
i = i + 1;
break;
case R.id.ImageView04:
// do something
img4.setVisibility(View.GONE);
i = i + 1;
break;
case R.id.ImageView05:
// do something
img5.setVisibility(View.GONE);
i = i + 1;
break;
case R.id.ImageView06:
// do something
img6.setVisibility(View.GONE);
i = i + 1;
break;
case R.id.ImageView07:
// do something
img7.setVisibility(View.GONE);
i = i + 1;
break;
case R.id.ImageView08:
// do something
img8.setVisibility(View.GONE);
i = i + 1;
break;
case R.id.ImageView09:
// do something
img9.setVisibility(View.GONE);
i = i + 1;
break;
}
}
ログキャット:
E/AndroidRuntime(1399): 致命的な例外: メイン E/AndroidRuntime(1399): java.lang.NullPointerException E/AndroidRuntime (1399): com.aliancegaming.duckduckgone.MainActivity.onClick (MainActivity.java:49) で E/AndroidRuntime(1399): android.view.View.performClick(View.java:4084) E/AndroidRuntime(1399): android.view.View$PerformClick.run(View.java:16966) で E/AndroidRuntime(1399): android.os.Handler.handleCallback(Handler.java:615) で E/AndroidRuntime(1399): android.os.Handler.dispatchMessage(Handler.java:92) で E/AndroidRuntime(1399): android.os.Looper.loop(Looper.java:137) E/AndroidRuntime(1399): android.app.ActivityThread.main(ActivityThread.java:4745) E/AndroidRuntime(1399): java.lang.reflect.Method.invokeNative(ネイティブメソッド) E/AndroidRuntime(1399): java.lang.reflect.Method.invoke(Method.java:511) E/AndroidRuntime (1399): com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:786) で E/AndroidRuntime (1399): com.android.internal.os.ZygoteInit.main (ZygoteInit.java:553) で E/AndroidRuntime(1399): dalvik.system.NativeStart.main(ネイティブメソッド)