package com.abner.listviewdemo;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import android.app.Activity;

import android.os.Bundle;

import android.widget.ArrayAdapter;

import android.widget.ListView;

import android.widget.SimpleAdapter;

public class MainActivity extends Activity {

private ListView listView;

private ArrayAdapter<String> arr_adapter;

private SimpleAdapter sim_adapter;

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

private int i;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.listview);

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

String[] arr_data = { "測(cè)試1", "測(cè)試2", "測(cè)試3" };

arr_adapter = new ArrayAdapter<String>(this,

android.R.layout.simple_list_item_1, arr_data);

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

listView.setAdapter(sim_adapter);

}

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

{

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

{

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

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

map.put("text", "測(cè)試 "+ i);

}

return datalist;

}

}

/*錯(cuò)誤日志

-11 02:10:05.531: E/AndroidRuntime(1030): FATAL EXCEPTION: main

04-11 02:10:05.531: E/AndroidRuntime(1030): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.abner.listviewdemo/com.abner.listviewdemo.MainActivity}: java.lang.NullPointerException

04-11 02:10:05.531: E/AndroidRuntime(1030): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1955)

04-11 02:10:05.531: E/AndroidRuntime(1030): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980)

04-11 02:10:05.531: E/AndroidRuntime(1030): at android.app.ActivityThread.access$600(ActivityThread.java:122)

04-11 02:10:05.531: E/AndroidRuntime(1030): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146)

04-11 02:10:05.531: E/AndroidRuntime(1030): at android.os.Handler.dispatchMessage(Handler.java:99)

04-11 02:10:05.531: E/AndroidRuntime(1030): at android.os.Looper.loop(Looper.java:137)

04-11 02:10:05.531: E/AndroidRuntime(1030): at android.app.ActivityThread.main(ActivityThread.java:4340)

04-11 02:10:05.531: E/AndroidRuntime(1030): at java.lang.reflect.Method.invokeNative(Native Method)

04-11 02:10:05.531: E/AndroidRuntime(1030): at java.lang.reflect.Method.invoke(Method.java:511)

04-11 02:10:05.531: E/AndroidRuntime(1030): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)

04-11 02:10:05.531: E/AndroidRuntime(1030): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)

04-11 02:10:05.531: E/AndroidRuntime(1030): at dalvik.system.NativeStart.main(Native Method)

04-11 02:10:05.531: E/AndroidRuntime(1030): Caused by: java.lang.NullPointerException

04-11 02:10:05.531: E/AndroidRuntime(1030): at android.widget.SimpleAdapter.getCount(SimpleAdapter.java:93)

04-11 02:10:05.531: E/AndroidRuntime(1030): at android.widget.ListView.setAdapter(ListView.java:460)

04-11 02:10:05.531: E/AndroidRuntime(1030): at com.abner.listviewdemo.MainActivity.onCreate(MainActivity.java:37)

04-11 02:10:05.531: E/AndroidRuntime(1030): at android.app.Activity.performCreate(Activity.java:4465)

04-11 02:10:05.531: E/AndroidRuntime(1030): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)

04-11 02:10:05.531: E/AndroidRuntime(1030): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1919)

04-11 02:10:05.531: E/AndroidRuntime(1030): ... 11 more

04-11 02:10:09.581: I/Process(1030): Sending signal. PID: 1030 SIG: 9

*/