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我对编程很陌生。我有一个有多个视图的应用程序。主视图显示早餐、午餐和晚餐等列表。选择一个物品后，示例午餐，显示午餐菜单的列表，例如汉堡包，芝士汉堡，炸薯条...（此列表是由\ valuts \ valuts \ valuts \ bunch.xml的弦乐阵列午餐_MENU创建的。 ) 当用户选择他们想要的项目时，它存储在一个名为 myNewList 的新数组中，并在用户按下 lunchList 按钮时显示。显示用户选择的所有项目。到目前为止，一切都很好。我在 selecteditems.xml 中创建了一个 android:onClick="shareMyList" 并且该按钮有效，但没有填充我的列表。我认为我需要一些如何将其转换为字符串的方法，这就是我需要帮助的地方。

这是我现在的问题......我有我的共享按钮，当按下它时，我希望它自动打开默认的消息应用程序并从所选项目 ListView 中填充列表。

package com.mycompany.lunch;

import java.util.ArrayList;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;

public class LunchListMenu extends Activity {  

    /** Called when the activity is first created. */
    @Override
    public void onCreate(final Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.maincoarse);
        final ListView lv=(ListView)findViewById(R.id.listView1);              
        ArrayAdapter<CharSequence> adapter=ArrayAdapter.createFromResource(this, R.array.lunch_menu,android.R.layout.simple_list_item_1);
        lv.setAdapter(adapter);
        final ArrayList<String> myNewList = new ArrayList<String>();
        lv.setOnItemClickListener(new OnItemClickListener() {



            @Override
            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {  
                String item=lv.getItemAtPosition(arg2).toString();
                String itemordered;
                itemordered = item + " added to list";
                Toast.makeText(getApplicationContext(), itemordered, Toast.LENGTH_SHORT).show();
                myNewList.add(item);                
            }
        });

                // List View Button
                Button btnLunchList = (Button) findViewById(R.id.lrList);
                btnLunchList.setOnClickListener(new View.OnClickListener() {

                    @Override
                    public void onClick(View v) {                       
                        setContentView(R.layout.selecteditems);
                        ListView selecteditems = (ListView) findViewById(android.R.id.list);
                        ArrayAdapter<String> newadapter = new ArrayAdapter<String>(LunchListMenu.this, android.R.layout.simple_list_item_1, myNewList);              
                        selecteditems.setAdapter(newadapter);
                    }
                });
    }
                    public void shareMyList(View v){
                        // Share Selected Items Button
                        Button btnShareItems = (Button) findViewById(R.id.shareMyList);
                        btnShareItems.setOnClickListener(new View.OnClickListener() {

                            @Override
                            public void onClick(View v) {
                                // TODO Auto-generated method stub

                                Intent share = new Intent(Intent.ACTION_SEND);
                                share.setType("text/plain");
                                share.putExtra(Intent.EXTRA_TEXT, "I'm being sent!!");
                                startActivity(Intent.createChooser(share, "Share Text"));
                            }


                        });
                    }
}

这是午餐菜单布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:background="@drawable/main_background"
    android:paddingLeft="10.0dip" 
    android:paddingTop="0.0dip" 
    android:paddingRight="10.0dip" 
    android:paddingBottom="10.0dip" 
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <Button
            android:id="@+id/lrList"
            android:layout_width="72dip"
            android:layout_height="72dip"
            android:layout_gravity="right"
            android:background="@drawable/list" />

         <ImageView
            android:id="@+id/LunchMenuTitle"
            android:contentDescription="@string/LunchMenu"
            android:layout_width="0dip"
            android:layout_height="72dip"
            android:layout_weight="0.96"
            android:background="@drawable/lunch"
            android:paddingLeft="10.0dip"
            android:paddingRight="10.0dip" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="10.0dip"
        android:background="@drawable/head"
        android:orientation="horizontal" />

    <ListView
        android:id="@+id/listView1"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:divider="#FFCC00"
        android:dividerHeight="2dp" >
    </ListView>

    <LinearLayout 
    android:orientation="horizontal" 
    android:background="@drawable/head" 
    android:layout_width="fill_parent" 
    android:layout_height="10.0dip" />  
</LinearLayout>

这是我的 selecteditems.xml 布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
      xmlns:android="http://schemas.android.com/apk/res/android"
      android:orientation="vertical"
      android:background="@drawable/main_background" 
      android:paddingLeft="10.0dip" 
      android:paddingTop="0.0dip" 
      android:paddingRight="10.0dip" 
      android:paddingBottom="10.0dip" 
      android:layout_width="fill_parent" 
      android:layout_height="fill_parent">

        <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <Button
            android:id="@+id/shareMyList"
            android:layout_width="72dip"
            android:layout_height="72dip"
            android:layout_gravity="right"
            android:onClick="shareMyList"
            android:background="@drawable/share" />

        <ImageView
            android:id="@+id/selectedItemsTitle"
            android:contentDescription="@string/LunchTitle"
            android:layout_width="0dip"
            android:layout_height="72dip"
            android:layout_weight="0.96"
            android:background="@drawable/title"
            android:paddingLeft="10.0dip"
            android:paddingRight="10.0dip" />

    </LinearLayout>

    <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="10.0dip"
            android:background="@drawable/head"
            android:orientation="horizontal" />  

              <ListView
                  android:id="@android:id/list"
                  android:layout_width="fill_parent"
                  android:layout_height="wrap_content"
                  android:divider="#FFCC00"
                  android:dividerHeight="2dp"
                  android:padding="10dip"
                  android:textColor="#ffffff"
                  android:textSize="20dip"
                  android:textStyle="bold" />

</LinearLayout>
4

1 回答 1

0

这可能是最笨拙的方法，但它确实有效。

package com.mycompany.lunch;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;

public class LunchListMenu extends Activity {

    String itemsordered;  

    /** Called when the activity is first created. */
    @Override
    public void onCreate(final Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.maincoarse);
        final ListView lv=(ListView)findViewById(R.id.listView1);              
        ArrayAdapter<CharSequence> adapter=ArrayAdapter.createFromResource(this, R.array.lunch_menu,android.R.layout.simple_list_item_1);
        lv.setAdapter(adapter);
        final ArrayList<String> myNewList = new ArrayList<String>();
        lv.setOnItemClickListener(new OnItemClickListener() {



            @Override
            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {  
                String item=lv.getItemAtPosition(arg2).toString();
                String itemordered;
                itemordered = item + " added to list";
                Toast.makeText(getApplicationContext(), itemordered, Toast.LENGTH_SHORT).show();
                myNewList.add(item);                
            }
        });

                // List View Button
                Button btnLunchList = (Button) findViewById(R.id.lrList);
                btnLunchList.setOnClickListener(new View.OnClickListener() {

                    @Override
                    public void onClick(View v) {                       
                        setContentView(R.layout.selecteditems);
                        ListView selecteditems = (ListView) findViewById(android.R.id.list);
                        ArrayAdapter<String> newadapter = new ArrayAdapter<String>(LunchListMenu.this, android.R.layout.simple_list_item_1, myNewList);              
                        selecteditems.setAdapter(newadapter);

                        // Get sdCard location so we can Create Dir and File
                        File sdCard = Environment.getExternalStorageDirectory();
                        File lunch = new File(sdCard,"Lunch");
                        lunch.mkdirs();
                        File file = new File(lunch, "Lunch.txt");
                        PrintWriter out = null;
                        try {
                            out = new PrintWriter(new FileWriter(file));
                        } catch (IOException e) {
                            e.printStackTrace();
                        }  

                        // Write each string in the array
                        StringBuilder text = new StringBuilder();
                        for (String s : myNewList) {  
                            out.println(s);  
                        }  
                        out.close();

                        // read File
                        try {
                            BufferedReader br = new BufferedReader(new FileReader(file));
                            String line;
                            while ((line = br.readLine()) != null) {
                                text.append(line);
                                text.append(',');
                                text.append(' ');
                            }
                        }
                        catch (IOException e) {
                        }
                        itemsordered = text; 
                    }
                });
    }

                    public void shareMyList(View v){
                        // Share Selected Items Button
                        Button btnShareItems = (Button) findViewById(R.id.shareMyList);
                        btnShareItems.setOnClickListener(new View.OnClickListener() {

                            @Override
                            public void onClick(View v) {
                                Intent sendIntent = new Intent(Intent.ACTION_VIEW);
                                sendIntent.putExtra("sms_body", itemsordered); 
                                sendIntent.setType("vnd.android-dir/mms-sms");
                                startActivity(sendIntent);
                            }
                        });
                    }
}
于 2012-07-29T15:35:07.783 回答