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为什么会白屏

Java;

package com.example.eat1;


import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;


import android.support.v7.app.ActionBarActivity;

import android.support.v7.app.ActionBar;

import android.support.v4.app.Fragment;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.ViewGroup;

import android.view.Window;

import android.view.WindowManager;

import android.widget.ArrayAdapter;

import android.widget.Button;

import android.widget.ListView;

import android.widget.SimpleAdapter;

import android.os.Build;


public class MainActivity extends ActionBarActivity {

private ListView listview;

private ArrayAdapter<String>arr_adapter;    

private SimpleAdapter simp_adapter;

private List<Map<String,Object>>dataList;

@Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        listview=(ListView) findViewById(R.id.listView);



        String[] arr_data={"慕课网1","慕课网2","慕课网1","慕课网2","慕课网1","慕课网2","慕课网1","慕课网2","慕课网1","慕课网2"};

        

        dataList=new ArrayList<Map<String,Object>>();

        arr_adapter=new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, arr_data);

simp_adapter=new SimpleAdapter(this,getData(),R.layout.item,new String[]{"pic","text"},new int[] {R.id.pic,R.id.text});

//       视图加载适配器

        listview.setAdapter(simp_adapter);

}

private List<Map<String,Object>> getData(){

for(int i=0;i<20;i++){

Map<String,Object>map=new HashMap<String, Object>();

map.put("pic", R.drawable.ic_launcher);

map.put("text", "慕课网"+i+1);

}

return dataList;

}

    }

xml;

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

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="horizontal" >


    <ImageView 

        android:id="@+id/pic"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:src="@drawable/ic_launcher"

        />

<TextView

   android:id="@+id/text"

   android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:textSize="20sp"

        android:textColor="#000000"

        android:text="demo"

   ></TextView>

</LinearLayout>


正在回答

3 回答

private List<Map<String,Object>> getData(){

for(int i=0;i<20;i++){

Map<String,Object>map=new HashMap<String, Object>();

map.put("pic", R.drawable.ic_launcher);

map.put("text", "慕课网"+i+1);

//要加上这一句

datalist.add(map);

}

return dataList;

}


1 回复 有任何疑惑可以回复我~

好吧。。。

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0 回复 有任何疑惑可以回复我~

1我 头晕的07.8184040.

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Android攻城狮的第二门课(第1季)
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