Question

我的警告对话框构建器中有微调器的问题，它在编译时没有显示任何错误，我也调用alertdialog.show()方法来显示我的自定义对话框，但它无法填充我的微调器项目。这是我的代码

public Dialog add_pop_up()
{
    AlertDialog.Builder builder = new AlertDialog.Builder(UgJadwal.this);
    LayoutInflater inflater = UgJadwal.this.getLayoutInflater();
    builder.setView(inflater.inflate(R.layout.addpopup, null));
    builder.setIcon(R.drawable.add);
    builder.setTitle("Add new schedule");

    builder.setPositiveButton(R.string.add, new DialogInterface.OnClickListener()
    {
        @Override
        public void onClick(DialogInterface dialog, int id)
        {
            day = (Spinner)findViewById(R.id.day);
            subject = (EditText)findViewById(R.id.subject);
            time = (EditText)findViewById(R.id.time);
            location = (Spinner)findViewById(R.id.location);
            lecture = (EditText)findViewById(R.id.lecture);
            ArrayAdapter<CharSequence> adapterDay = ArrayAdapter.createFromResource(UgJadwal.this, R.array.day, android.R.layout.simple_spinner_item);
            adapterDay.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
            day.setAdapter(adapterDay);
            Toast.makeText(getApplicationContext(), "Added Successfully!", Toast.LENGTH_SHORT).show();
        }
    });
    builder.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener()
    {
        @Override
        public void onClick(DialogInterface dialog, int id)
        {
            //
        }
    });
    return builder.create();
}

logcat的：

03-17 20:14:59.030: E/AndroidRuntime(9889): FATAL EXCEPTION: main
03-17 20:14:59.030: E/AndroidRuntime(9889): java.lang.NullPointerException
03-17 20:14:59.030: E/AndroidRuntime(9889):     at com.rk.ug_simplify.UgJadwal$3.onClick(UgJadwal.java:195)
03-17 20:14:59.030: E/AndroidRuntime(9889):     at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:158)
03-17 20:14:59.030: E/AndroidRuntime(9889):     at android.os.Handler.dispatchMessage(Handler.java:99)
03-17 20:14:59.030: E/AndroidRuntime(9889):     at android.os.Looper.loop(Looper.java:123)
03-17 20:14:59.030: E/AndroidRuntime(9889):     at android.app.ActivityThread.main(ActivityThread.java:4627)
03-17 20:14:59.030: E/AndroidRuntime(9889):     at java.lang.reflect.Method.invokeNative(Native Method)
03-17 20:14:59.030: E/AndroidRuntime(9889):     at java.lang.reflect.Method.invoke(Method.java:521)
03-17 20:14:59.030: E/AndroidRuntime(9889):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
03-17 20:14:59.030: E/AndroidRuntime(9889):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
03-17 20:14:59.030: E/AndroidRuntime(9889):     at dalvik.system.NativeStart.main(Native Method)

UPDATE！上面是我的logcat，但该错误指向自定义对话框的另一个上下文。有没有人知道我的错误？感谢您的帮助，谢谢！

更新2 !!添加视图

public Dialog add_pop_up()
{
    AlertDialog.Builder builder = new AlertDialog.Builder(UgJadwal.this);
    LayoutInflater inflater = UgJadwal.this.getLayoutInflater();
    final View dialogview = inflater.inflate(R.layout.addpopup, null);
    builder.setView(dialogview);
    builder.setIcon(R.drawable.add);
    builder.setTitle("Add new schedule");

    builder.setPositiveButton(R.string.add, new DialogInterface.OnClickListener()
    {
        @Override
        public void onClick(DialogInterface dialog, int id)
        {
            day = (Spinner)dialogview.findViewById(R.id.day);
            subject = (EditText)dialogview.findViewById(R.id.subject);
            time = (EditText)dialogview.findViewById(R.id.time);
            location = (Spinner)dialogview.findViewById(R.id.location);
            lecture = (EditText)dialogview.findViewById(R.id.lecture);

            ArrayAdapter<CharSequence> adapterDay = ArrayAdapter.createFromResource(UgJadwal.this, R.array.day, android.R.layout.simple_spinner_item);
            adapterDay.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
            day.setAdapter(adapterDay);
            String sub = subject.getText().toString();
            Toast.makeText(UgJadwal.this, "Success " + sub, Toast.LENGTH_SHORT).show();
        }
    });

Answer 1

如果Spinner在Dialog布局内，那么您将需要使用Dialog Layout实例来访问它。将您的代码更改为：

 AlertDialog.Builder builder = new AlertDialog.Builder(UgJadwal.this);
    LayoutInflater inflater = UgJadwal.this.getLayoutInflater();

    // inflate layout to View 
    View dialogview = inflater.inflate(R.layout.dialog_layout, null);

    builder.setView(dialogview);  //<< set view for Dialog

    //....your code here....

    builder.setPositiveButton(R.string.add, new DialogInterface.OnClickListener()
    {
        @Override
        public void onClick(DialogInterface dialog, int id)
        {
          day = (Spinner)dialogview.findViewById(R.id.day); //<< access Spinner

          // do same for other Views to access it from dialogview
          // your code here...

Answer 2

public void Getradius() {
    // Set up download interaction. Display a dialog
    // when the user clicks download button and require
    // a user-provided region name
    android.app.AlertDialog.Builder builder = new android.app.AlertDialog.Builder(class.this);

    final Spinner min_zoom=new Spinner(class.this);
    final Spinner max_zoom=new Spinner(class.this);


    ArrayAdapter min = new ArrayAdapter(this, R.layout.spinner_item_register, minzoom_values);
    min.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    min_zoom.setAdapter(min);

    // Build the dialog box
    builder.setTitle("Set Radius")
            .setView(min_zoom)
            .setPositiveButton("GET COURSE LIST", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {

                }
            })
            .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.cancel();
                }
            });
    // Display the dialog
    builder.show();
}

在android对话框构建器中创建微调器适配器

2 个答案: