0

我试图将记录添加到我的 sqlite 数据库。如果单击“添加”，则会打开一个 DialogFragment。然后，当您将一些信息写入文本字段并在 Spinner 中选择一个选项时，它应该被添加到 sqlite 数据库中。如果我从主要活动中执行此操作，则此方法有效。但是我只有在尝试从 DialogFragment 中获取相同内容时才获得 FC。

对话框片段代码：

public class CustomDialogFragment extends DialogFragment {

    Spinner spin;
    EditText etNumber, etForwardNumber;
    Boolean initialDisplay = true;
    Database mDB = new Database(getActivity());
    Cursor c;

public void DialogFragment(){
    // Empty constructor required for DialogFragment
}

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());

    View view = getActivity().getLayoutInflater().inflate(R.layout.activity_dialog, null);

    etNumber = (EditText)view.findViewById(R.id.etNumber);
    etForwardNumber = (EditText)view.findViewById(R.id.etForwardNumber);

    etNumber.setHint("Phone Number");
    etForwardNumber.setHint("Forward Number");

    etForwardNumber.setVisibility(View.GONE);

    spin = (Spinner)view.findViewById(R.id.spOptions);
    List<String> list = new ArrayList<String>();
    list.add("Block Call");
    list.add("Forward Call");

    ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(getActivity(),
            android.R.layout.simple_spinner_item, list); 
    dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    spin.setAdapter(dataAdapter);

    spin.setOnItemSelectedListener(new OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int position, long id) {
            Log.d("DIALOGFRAGMENT", "Option selected: " + position);
            if (position == 0) {
                Log.d("LOG_TAG", "Block");
                etForwardNumber.setVisibility(View.GONE);
                //Log.d("LOG_TAG", initialDisplay.toString());
                //initialDisplay = false;
            }else {
                Log.d("LOG_TAG", "Forward");
                etForwardNumber.setVisibility(View.VISIBLE);
            }
        }
        @Override
        public void onNothingSelected(AdapterView<?> parentView) {
            // your code here
        }

    });

    builder.setMessage("")
        .setTitle("Add a new number")
        .setView(view);
    builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int id) {
        //Hide the dialog
        }
    });
    builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int id) {
            //Add records to sqlite database
            mDB.open();
            String cname = "test";
            String caction = "Forward";
            //String cnumber = "Numbertoforward";
            ContentValues cv = new ContentValues();
            cv.put("cName", cname);
            cv.put("cAction", caction);
            //cv.put("cNumber", cnumber);
            mDB.empInsert(cv);
            c.requery();
        }
    });

    return builder.create();
}

/*@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    //Inflate the XML view for the help dialog fragment
    //View view = inflater.inflate(R.layout.activity_dialog, container);
    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());

    // 2. Chain together various setter methods to set the dialog characteristics
    /*builder.setMessage("Test msg")
        .setTitle("Title");
    builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int id) {
            // User clicked OK button
        }
    });
    builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int id) {
            // User cancelled the dialog
        }
    });*/
    /*return view;
    } */
}

日志猫：

10-23 15:06:00.125: E/AndroidRuntime(14935): FATAL EXCEPTION: main
10-23 15:06:00.125: E/AndroidRuntime(14935): java.lang.NullPointerException
10-23 15:06:00.125: E/AndroidRuntime(14935):    at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:224)
10-23 15:06:00.125: E/AndroidRuntime(14935):    at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:164)
10-23 15:06:00.125: E/AndroidRuntime(14935):    at com.spxc.forwardcalls.Database.open(Database.java:23)
10-23 15:06:00.125: E/AndroidRuntime(14935):    at com.spxc.forwardcalls.CustomDialogFragment$3.onClick(CustomDialogFragment.java:90)
10-23 15:06:00.125: E/AndroidRuntime(14935):    at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:166)
10-23 15:06:00.125: E/AndroidRuntime(14935):    at android.os.Handler.dispatchMessage(Handler.java:99)
10-23 15:06:00.125: E/AndroidRuntime(14935):    at android.os.Looper.loop(Looper.java:137)
10-23 15:06:00.125: E/AndroidRuntime(14935):    at android.app.ActivityThread.main(ActivityThread.java:5103)
10-23 15:06:00.125: E/AndroidRuntime(14935):    at java.lang.reflect.Method.invokeNative(Native Method)
10-23 15:06:00.125: E/AndroidRuntime(14935):    at java.lang.reflect.Method.invoke(Method.java:525)
10-23 15:06:00.125: E/AndroidRuntime(14935):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
10-23 15:06:00.125: E/AndroidRuntime(14935):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
10-23 15:06:00.125: E/AndroidRuntime(14935):    at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:112)
10-23 15:06:00.125: E/AndroidRuntime(14935):    at dalvik.system.NativeStart.main(Native Method)

任何帮助深表感谢！

4

1 回答 1

0

一开始很难说，但是您的数据库似乎没有正确初始化。你应该搬家

Database mDB = new Database(getActivity());

到您的 onCreateDialog 方法。将其移至此处将确保 getActivity() 返回用于初始化数据库的上下文。

或者，我强烈建议使用某种使用单例模式的 DatabaseHelper 类。因此，您可以更灵活地从应用程序中的任何位置访问您的数据库。

于 2013-10-23T13:25:26.737 回答