将数据从活动传递到对话框

问题描述

| 我正在寻找一种将数据从活动传递到对话框的方法。我正在尝试呼叫“ 0”,但是我看不到将任何数据传递到对话框的方法。 我需要将字符串传递给对话框以显示确认信息:) 干杯     

解决方法

如果您定位的是Android 2.2(API级别8或更高),则可以使用
 public final boolean showDialog (int id,Bundle args)
并在arguments2ѭ中传递您的论点。请参阅文档。 如果要支持较旧的Android版本,则应将参数保存在
Activity
类成员中,然后从
onPrepareDialog
函数中访问它们。请注意,
onCreateDialog
不能满足您的需要,因为创建对话框只调用一次。
class MyActivity {

    private static int MY_DLG = 1;
    private String m_dlgMsg;

    private showMyDialog(String msg){
        m_dlgMsg = msg;
        showDialog(MY_DLG);
    }

    private doSomething() {
        ...
        showMyDlg(\"some text\");
    }

    protected void onCreateDialog(int id){
        if(id == MY_DLG){
            AlertDialog.Builder builder = new AlertDialog.Builder(this); 
            ....
            return builder.create();
         }
         return super.onCreateDialog(id);
    }        

    @Override
    protected void onPrepareDialog (int id,Dialog dialog){ 
         if(id == MY_DLG){ 
            AlertDialog adlg = (AlertDialog)dialog;
            adlg.setMessage(m_dlgMsg);
         } else {
            super.onPrepareDialog(id,dialog);
         }             
    }
}
    ,在执行showDialog(int)时,将调用Activity的onCreateDialog方法。在这里,您必须创建一个对话框实例并返回它,它将显示出来。 然后,您将创建一个对话框,您可以完全访问您的“类”字段,并且可以使用它们的值来调整所创建对话框的参数和内容。     ,
//`enter code here`I used shared preferences and it worked.
**in your activity:**

//your field:  public static final String GAME_PREFERENCES = null;

                        String template = selectedItem.getProduct().getName();
            String num = selectedItem.getNumber();
            String id = selectedItem.getId();
            String location = selectedItem.getLocationName();


        SharedPreferences settings = getSharedPreferences(GAME_PREFERENCES,MODE_PRIVATE);
            SharedPreferences.Editor prefEditor = settings.edit();
            prefEditor.putString(\"template\",template);
            prefEditor.putString(\"num\",num);
            prefEditor.putString(\"id\",id);
            prefEditor.putString(\"location\",location);
            prefEditor.commit();

**in your dialog class:**
//In my case I needed to add activity because how i created dialog:

public MyDialog(Context context,int theme) {
        super(context,theme);
        init(context);
    }

    private void init(Context context) {
        setContentView(R.layout.dialog);
        this.context = context;
        final Activity activity = (Activity) context;

              // If you dont call activity you can try context.getpreferences(......)
        SharedPreferences prefs = ((Activity) context)
                .getPreferences(Context.MODE_PRIVATE);

        String template = prefs.getString(\"template\",\"\");
        String num = prefs.getString(\"num\",\"\");
        String id = prefs.getString(\"id\",\"\");
        String location = prefs.getString(\"location\",\"\");

}`enter code here`
    ,我知道这个问题很旧,但是如果使用自定义对话框,则可以使用
setArguments
方法。
String myString = \"How to do it\"
DialogFragment newFragment = new AddUserDialog();
                Bundle args = new Bundle();
                args.putString(\"number\",myString); //The first parameter is the key that will be used to retrieve the value,which is the second parameter.
                newFragment.setArguments(args);
                newFragment.show(getSupportFragmentManager(),\"add_a_member\");