android，这代码怎么改，帮帮我

YXTS122 2016-09-30 09:42:37

MainActivity.java

package com.example.ch02_dan;





import android.app.Activity;

import android.app.AlertDialog;

import android.content.DialogInterface;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;





public class MainActivity extends Activity implements OnClickListener {

	

	final String[] arrayFruit=new String[]{"苹果","橘子","草莓","香蕉"};

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        Button button=(Button)findViewById(R.id.bt1);

        button.setOnClickListener(this);





    }

    

    @Override

    public void onClick(View v)

    {

       switch (v.getId())

       {

       case R.id.bt1:

    	        

                AlertDialog dia=new AlertDialog.Builder(this ).create();

                dia.setTitle("你喜欢吃哪种水果？");

                dia.setSingleChoiceItems(arrayFruit,0,listen);

                dia.setButton(AlertDialog.BUTTON_POSITIVE,"确定",listener);

                dia.setButton(AlertDialog.BUTTON_NEGATIVE,"取消",liss);

                dia.show();

       }

     }

    





DialogInterface.OnClickListener listen=new DialogInterface.OnClickListener()

{

	public void onClick(DialogInterface  dialog,int which)

	{

		selectedFruitIndex=which;

	}

};





DialogInterface.OnClickListener listener=new DialogInterface.OnClickListener()

{

	public void onClick(DialogInterface  dialog,int which)

	{

		Toast toast1=Toast.makeText(DialogDemoActivity.this,arrayFruit[selectedFruitIndex],Toast.LENGTH_SHORT);

		toast1.show();

	}

};









DialogInterface.OnClickListener liss=new DialogInterface.OnClickListener()

{

	public void onClick(DialogInterface  dialog,int which)

	{

	}

};









    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.

        getMenuInflater().inflate(R.menu.main, menu);

        return true;

    }



    @Override

    public boolean onOptionsItemSelected(MenuItem item) {

        // Handle action bar item clicks here. The action bar will

        // automatically handle clicks on the Home/Up button, so long

        // as you specify a parent activity in AndroidManifest.xml.

        int id = item.getItemId();

        if (id == R.id.action_settings) {

            return true;

        }

        return super.onOptionsItemSelected(item);

    }

}

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context="com.example.ch02_dan.MainActivity" >



    



<Button

    android:id="@+id/bt1"

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

      android:text="@string/xuan"

       android:textSize="20sp"/>





</RelativeLayout>

strings.xml

<?xml version="1.0" encoding="utf-8"?>

<resources>



    <string name="app_name">单选框</string>

    <string name="hello_world">Hello world!</string>

    <string name="action_settings">Settings</string>

      <string name="xuan">选择</string>

    

</resources>

...全文

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山鹰1985 2016-09-30

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引用楼主 YXTS122 的回复:

MainActivity.java

结账嘿

YXTS122 2016-09-30

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developerzjy 2016-09-30

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兄弟，工程自己建的，代码从别处复制过来的吧

山鹰1985 2016-09-30

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引用楼主 YXTS122 的回复:

MainActivity.java


import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

import com.google.android.gms.appindexing.AppIndex;
import com.google.android.gms.common.api.GoogleApiClient;


public class MainActivity extends Activity implements OnClickListener {

    final String[] arrayFruit = new String[]{"苹果", "橘子", "草莓", "香蕉"};
    /**
     * ATTENTION: This was auto-generated to implement the App Indexing API.
     * See https://g.co/AppIndexing/AndroidStudio for more information.
     */
    private GoogleApiClient client;
    private int selectedFruitIndex;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button button = (Button) findViewById(R.id.bt1);
        button.setOnClickListener(this);

        // ATTENTION: This was auto-generated to implement the App Indexing API.
        // See https://g.co/AppIndexing/AndroidStudio for more information.
        client = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build();
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.bt1:
                AlertDialog.Builder dia = new AlertDialog.Builder(this);
                dia.setTitle("你喜欢吃哪种水果？");
                dia.setSingleChoiceItems(arrayFruit, selectedFruitIndex, listen);
                dia.setPositiveButton("确定", listener);
                dia.setNegativeButton("取消", liss);
                dia.show();
        }
    }

    DialogInterface.OnClickListener listen = new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
            selectedFruitIndex = which;
        }
    };

    DialogInterface.OnClickListener listener = new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
            Toast.makeText(MainActivity.this, arrayFruit[selectedFruitIndex], Toast.LENGTH_SHORT).show();
        }
    };

    DialogInterface.OnClickListener liss = new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
            selectedFruitIndex = 0;
        }
    };
}

已经可以运行了,给分吧,关于 dialog 建议你还是多去百度下,这些基本的东西你都没弄懂额.

ink_s 2016-09-30

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引用 2 楼 ink_s 的回复:

Toast toast1=Toast.makeText(mainActivity.this,arrayFruit[selectedFruitIndex],Toast.LENGTH_SHORT); Toast没导包 selectedFruitIndex没有赋初值

selectedFruitIndex=which; selectedFruitIndex没有初始化

ink_s 2016-09-30

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Toast toast1=Toast.makeText(mainActivity.this,arrayFruit[selectedFruitIndex],Toast.LENGTH_SHORT); Toast没导包 selectedFruitIndex没有赋初值

ink_s 2016-09-30

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这图截的6 自动打码

YXTS122 2016-09-30

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package com.example.ch02_dan;
 
 
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
 
 
public class MainActivity extends Activity implements OnClickListener {
     
    final String[] arrayFruit=new String[]{"苹果","橘子","草莓","香蕉"};
    private int selectedFruitIndex;
    
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button button=(Button)findViewById(R.id.bt1);
        button.setOnClickListener(this);
        Button butt=(Button)findViewById(R.id.bt2);
        butt.setOnClickListener(this);
 
 
    }
     
    @Override
    public void onClick(View v)
    {
       switch (v.getId())
       {
       case R.id.bt1:
                 
                AlertDialog dia=new AlertDialog.Builder(this ).create();
                dia.setTitle("你喜欢吃哪种水果？");
                 dia.setSingleChoiceItems(arrayFruit,0,listen);
                dia.setButton(AlertDialog.BUTTON_POSITIVE,"确定",listener);
                dia.setButton(AlertDialog.BUTTON_NEGATIVE,"取消",liss);
                dia.show();
                break;
       case R.id.bt2:
           
           AlertDialog di=new AlertDialog.Builder(this ).create();
           di.setTitle("请输入:");
            di.setView(new EditText(this));
           di.setButton(AlertDialog.BUTTON_POSITIVE,"确定",listener);
           di.setButton(AlertDialog.BUTTON_NEGATIVE,"取消",liss);
           di.show();    
           break;
       }
     }
     
 
 
DialogInterface.OnClickListener listen=new DialogInterface.OnClickListener()
{
    public void onClick(DialogInterface  dialog,int which)
    {
        selectedFruitIndex=which;
    }
};
 
 
DialogInterface.OnClickListener listener=new DialogInterface.OnClickListener()
{
    public void onClick(DialogInterface  dialog,int which)
    {
        Toast toast1=Toast.makeText(MainActivity.this,arrayFruit[selectedFruitIndex],Toast.LENGTH_SHORT);
        toast1.show();
    }
};
 
 
 
 
DialogInterface.OnClickListener liss=new DialogInterface.OnClickListener()
{
    public void onClick(DialogInterface  dialog,int which)
    {
    }
};
 
 
 
 
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
 
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

dia.setSingleChoiceItems(arrayFruit,0,listen);这个一直报错