java - 如何使用 AlertDialog 预选单选按钮？

Question

有人可以帮我吗？我有一个 AlertDialog 框，它工作正常，但我想要的是当弹出 alertdialog 时，它会自动选中其中一个单选按钮。

例如弹出提示对话框时勾选“10分钟”。

怎么做？

下面是我的工作代码。

final CharSequence[] deleteFilesBy = {"5 minutes","10 minutes", "15 minutes"};
AlertDialog.Builder builder = new AlertDialog.Builder(this);
                builder.setTitle("Delete Files by?")
                    .setSingleChoiceItems(deleteFilesBy,-1, new DialogInterface.OnClickListener()
                        {   
                            @Override
                            public void onClick(DialogInterface dialog, int which) 
                            {
                                if(deleteFilesBy[which]=="5 minutes")
                                {
                                    // do something
                                }
                                else if (deleteFilesBy[which]=="10 minutes")
                                {
                                    // do something
                                }
                                else if (deleteFilesBy[which]=="15 minutes")
                                {
                                    // do something
                                }
                                dialog.dismiss();
                            }
                        }).setNeutralButton("Cancel", new DialogInterface.OnClickListener() {

                            @Override
                            public void onClick(DialogInterface arg0, int arg1) {
                                // TODO Auto-generated method stub
                                arg0.dismiss();
                            }
                        });

                 AlertDialog alert = builder.create();
                 alert.show();

请帮忙!

谢谢

RJUY

Answer 1

TestRadio.java:

package com.dave.kelley;



import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.RadioButton;

public class TestRadioActivity extends Activity {

    int timeSetting = 0;
    RadioButton radio0;
    RadioButton radio1;
    RadioButton radio2;
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Button button = (Button) findViewById(R.id.button1);
        button.setOnClickListener(listener);
        radio0 = (RadioButton) findViewById(R.id.radio0);
        radio1 = (RadioButton) findViewById(R.id.radio1);
        radio2 = (RadioButton) findViewById(R.id.radio2);
    }

    public OnClickListener listener = new OnClickListener() {
        public void onClick(View v) {
            if (timeSetting == 0) {
                radio0.setChecked(true);
                radio1.setChecked(false);radio2.setChecked(false);
            }
            if (timeSetting == 1) {
                radio1.setChecked(true);
                radio0.setChecked(false);radio2.setChecked(false);
            }
            if (timeSetting == 2) {
                radio2.setChecked(true);
                radio0.setChecked(false);radio1.setChecked(false);
            }
            timeSetting++;
            if(timeSetting == 3 || timeSetting > 3) {
                timeSetting = 0;
            }
        }
    };
}

主.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <RadioGroup
        android:id="@+id/radioGroup1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >

        <RadioButton
            android:id="@+id/radio0"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:checked="true"
            android:text="RadioButton" />

        <RadioButton
            android:id="@+id/radio1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="RadioButton" />

        <RadioButton
            android:id="@+id/radio2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="RadioButton" />

    </RadioGroup>

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button" />

</LinearLayout>