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認爲問題在於onClick類，但我不確定。每當我檢查我的遊戲回答時，它只是突然崩潰當我按下檢查哪個是「chckAns」按鈕我的應用程序突然不斷崩潰
package com.example.machineproblemsix;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.DialogFragment;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
public class SecondActivity extends Activity {
static Context context;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
}
public void doBack(View v){
finish();
}
public static class LoginDialogFragment extends DialogFragment{
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
// Use the Builder class for convenient dialog construction
AlertDialog.Builder builder = new
AlertDialog.Builder(getActivity());
LayoutInflater inflater = getActivity().getLayoutInflater();
View v = inflater.inflate(R.layout.jake_layout, null);
final EditText etAnswer = (EditText)
v.findViewById(R.id.answer);
final EditText etAnswerTwo = (EditText)
v.findViewById(R.id.answerTwo);
builder.setView(v)
.setPositiveButton(R.string.login, new
DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int
id) {
String answer, answertwo;
answer = etAnswer.getText().toString();
answertwo = etAnswerTwo.getText().toString();
String msg;
if(answer.equalsIgnoreCase("jake")){
msg = "CORRECT!";
}else if(answertwo.equalsIgnoreCase("beemo")||
(answertwo.equalsIgnoreCase("bmo"))){
msg = "CORRECT!";
} else {
msg = "TRY AGAIN!";
}
Toast.makeText(context, msg,
Toast.LENGTH_SHORT).show();
}
})
.setNegativeButton(R.string.cancel,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int id) {
// User cancelled the dialog
}
});
// Create the AlertDialog object and return it
return builder.create();
}
}
public void showLogin(View v){
DialogFragment loginFragment = new LoginDialogFragment();
loginFragment.show(getFragmentManager(), "login");
}
}
我認爲問題在於onClick類，但我不確定。每當我檢查我的遊戲回答時，它只是突然崩潰
================================= ===============================================
日誌：
02-07 23:30:29.070: E/AndroidRuntime(924): FATAL EXCEPTION: main
02-07 23:30:29.070: E/AndroidRuntime(924): Process: com.example.machineproblemsix, PID: 924
02-07 23:30:29.070: E/AndroidRuntime(924): java.lang.NullPointerException
02-07 23:30:29.070: E/AndroidRuntime(924): at com.example.machineproblemsix.SecondActivity$LoginDialogFragment$1.onClick(SecondActivity.java:52)
02-07 23:30:29.070: E/AndroidRuntime(924): at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:166)
02-07 23:30:29.070: E/AndroidRuntime(924): at android.os.Handler.dispatchMessage(Handler.java:102)
02-07 23:30:29.070: E/AndroidRuntime(924): at android.os.Looper.loop(Looper.java:136)
02-07 23:30:29.070: E/AndroidRuntime(924): at android.app.ActivityThread.main(ActivityThread.java:5001)
02-07 23:30:29.070: E/AndroidRuntime(924): at java.lang.reflect.Method.invokeNative(Native Method)
02-07 23:30:29.070: E/AndroidRuntime(924): at java.lang.reflect.Method.invoke(Method.java:515)
02-07 23:30:29.070: E/AndroidRuntime(924): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
02-07 23:30:29.070: E/AndroidRuntime(924): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
02-07 23:30:29.070: E/AndroidRuntime(924): at dalvik.system.NativeStart.main(Native Method)
====================================== ==================================================================================
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ImageView
android:layout_width="match_parent"
android:layout_height="200dp"
android:background="#000"
android:contentDescription="@string/app_name"
android:scaleType="center"
android:src="@drawable/jake" />
<EditText
android:id="@+id/answer"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="4dp"
android:layout_marginLeft="4dp"
android:layout_marginRight="4dp"
android:layout_marginTop="16dp"
android:hint="@string/hint_answer"
android:inputType="textEmailAddress" />
</LinearLayout>
沒有崩潰log（logcat）很難預測這個問題，請粘貼你的logcat –
請注意你的佈局（jake_layout） –
對不起，因爲我的代碼沒有組織，我在其他一些活動中只是爲了加快速度up – kdz