学习android listview及其原生下拉刷新的笔记

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listview的建立

1.定义一个Data实体类（作为listview适配器的适配类型）

代码如下

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public class Data {
    public String name;
    public int imageId;
    public Data(String name,int imageId)
    {
        this.name = name;
        this.imageId = imageId;
    }
    public String getName(){
        return name;
    }
    public int getImageId()
    {
        return imageId;
    }
}

2.在layout目录下建立item.xml（用于加载listview中每一项的内容）

代码如下

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <ImageView
        android:id="@+id/image"
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        />
    <TextView
        android:id="@+id/text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        />
</LinearLayout>

3.创建一个自定义的适配器，继承自Arraydapter，并将泛型指定为Data类

代码如下

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public class DataAdapter extends ArrayAdapter{
    private int resourceId;
    public DataAdapter(Context context, int textViewResourceId, List<Data> object){
        super(context,textViewResourceId,object);
        resourceId = textViewResourceId;
    }
    @Override
    public View getView(int position,View convertView,ViewGroup parent){
        Data data = (Data) getItem(position);
        View view = LayoutInflater.from(getContext()).inflate(resourceId,null);
        ImageView dataimage = (ImageView)view.findViewById(R.id.image);
        TextView dataName = (TextView)view.findViewById(R.id.text);
        dataimage.setImageResource(data.getImageId());
        dataName.setText(data.getName());
        return view;
    }
}

4.然后就是MainActivity

代码如下

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public class MainActivity extends AppCompatActivity {
    private List<Data> dataList = new ArrayList<Data>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initData();
        DataAdapter adapter = new DataAdapter(Main2Activity.this,R.layout.item,dataList);
        ListView listview = (ListView)findViewById(R.id.listview1);
        listview.setAdapter(adapter);
        listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Data data = dataList.get(position);
                Toast.makeText(MainActivity.this,data.getName(), Toast.LENGTH_LONG).show();
            }
        });
    }
    private void initData(){
        Data biyadi = new Data("biyadi",R.drawable.biyadi);
        dataList.add(biyadi);
        Data falali = new Data("falali",R.drawable.falali);
        dataList.add(falali);
    }
}

5.最后别忘了在activity_main.xml中添加listview控件

代码如下

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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.ding.listview_practice.MainActivity"
    android:weightSum="1">
        <ListView
        android:id="@+id/listview1"
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        >
    </ListView>
</LinearLayout>

google原生下拉刷新

只需对上面的代码作如下修改

1.修改activity_main.xml

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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.ding.listview_practice.MainActivity"
    android:weightSum="1">
    <LinearLayout
        android:layout_width="400dp"
        android:layout_height="65dp">
    <EditText
        android:layout_height="wrap_content"
        android:layout_width="339dp"/>
    </LinearLayout>

    <android.support.v4.widget.SwipeRefreshLayout
        android:id="@+id/id_swipe_ly"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <ListView
        android:id="@+id/listview1"
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        >
    </ListView>
    </android.support.v4.widget.SwipeRefreshLayout>
</LinearLayout>

2.修改MainActivity

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public class MainActivity extends Activity implements SwipeRefreshLayout.OnRefreshListener{
    private static final int REFRESH_COMPLETE = 0X110;
    private List<Data> dataList = new ArrayList<Data>();
    private ArrayAdapter adapter;
    private ListView listview;
    private SwipeRefreshLayout mSwipeLayout;

    private Handler mHandler = new Handler()
    {
        public void handleMessage(android.os.Message msg)
        {
            switch (msg.what)
            {
                case REFRESH_COMPLETE:
                    Data as = new Data("as",R.drawable.asd);
                    dataList.add(as);
                    adapter.notifyDataSetChanged();
                    mSwipeLayout.setRefreshing(false);
                    break;

            }
        };
    };
    @SuppressLint("InlinedApi")
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initdata();
        adapter = new DataAdapter(MainActivity.this,R.layout.item,dataList);
        listview = (ListView)findViewById(R.id.listview1);
        mSwipeLayout = (SwipeRefreshLayout) findViewById(R.id.id_swipe_ly);
        mSwipeLayout.setOnRefreshListener(this);
        mSwipeLayout.setColorScheme(android.R.color.holo_blue_bright, android.R.color.holo_green_light,
                android.R.color.holo_orange_light, android.R.color.holo_red_light);
        listview.setAdapter(adapter);
    }
    public void onRefresh()
    {
        mHandler.sendEmptyMessageDelayed(REFRESH_COMPLETE, 2000);
    }
    private void initdata()
    {
        Data asd = new Data("asd",R.drawable.asd);
        dataList.add(asd);
    }
}
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