ListView可能是Android开发中最常用的一个控件,但要用的纯熟还需要不断的锻炼。
建立简单的ListView
1.在布局文件(.
2.在MainActivity.java中用适配器绑定
1 private String[] data = { "Apple", "Banana", "Orange", "Watermelon",2 "Pear", "Grape", "Pineapple", "Strawberry", "Cherry", "Mango" };3 4 5 ArrayAdapter<String> adapter = new ArrayAdapter<String>(6 MainActivity.this, android.R.layout.simple_list_item_1, data);7 ListView listView = (ListView) findViewById(R.id.list_view);8 listView.setAdapter(adapter);
可以看到 数组内容无法直接加到ListView中,所以要用适配器。
适配器中我用到了String来显示字符串,在往后这里可能会加入更复杂的内容,比如复合类型数据。
ArrayAdapter有多个构造函数,我这里的值分别是:调用的类,ListView的样式与数据来源。
简而言之,数据源是多样的,要想把他显示到ListView上,我们要使用适配器。
建立带图片的ListView
1.建立一个用于保存复合类型的类
2.创建1相应的布局文件
3.给1建立专用的适配器(extends ArrayAdapter)
4.在MainActivity中为ListView绑定适配器 1 package com.example.ran.listviewdemo;
2 3 /** 4 * Created by Ran on 2016/3/21. 5 */ 6 public class MyData 7 {
8 private String name; 9 private int imageId; 10 11 public MyData(String name,int imageId)12 {13 this.name = name;14 this.imageId = imageId;15 }16 public String getName() {17 return name;18 }19 public int getImageId() {20 return imageId;21 }22 }
imageId是对应图片的资源ID
1 <??> 2 <LinearLayout ="http://schemas.android.com/apk/res/android" 3 android:layout_width="match_parent" 4 android:layout_height="match_parent"> 5 6 <ImageView 7 android:id="@+id/iimage" 8 android:layout_width="wrap_content" 9 android:layout_height="wrap_content" />10 11 <TextView12 android:id="@+id/iname"13 android:layout_width="wrap_content"14 android:layout_height="wrap_content"15 />16 </LinearLayout>
1 package com.example.ran.listviewdemo; 2 3 import android.content.Context; 4 import android.view.LayoutInflater; 5 import android.view.View; 6 import android.view.ViewGroup; 7 import android.widget.ArrayAdapter; 8 import android.widget.ImageView; 9 import android.widget.TextView;10 11 import java.util.List;12 13 /**14 * Created by Ran on 2016/3/21.15 */16 public class MyDataAdapter extends ArrayAdapter<MyData> {17 private int resourceId;18 19 public MyDataAdapter(Context context, int textViewResourceId,List<MyData> objects)20 {21 super(context, textViewResourceId, objects);22 resourceId = textViewResourceId;23 }24 25 @Override26 public View getView(int position, View convertView, ViewGroup parent)27 {28 MyData myData = getItem(position);29 View view = LayoutInflater.from(getContext()).inflate(resourceId, null);30 ImageView iimage = (ImageView) view.findViewById(R.id.iimage);31 TextView iname = (TextView) view.findViewById(R.id.iname);32 iimage.setImageResource(myData.getImageId());33 iname.setText(myData.getName());34 return view;35 }36 }
1 package com.example.ran.listviewdemo; 2 3 import android.support.v7.app.AppCompatActivity; 4 import android.os.Bundle; 5 import android.widget.ListView; 6 7 import java.util.ArrayList; 8 import java.util.List; 9 10 public class MainActivity extends AppCompatActivity {11 12 private List<MyData> dataList = new ArrayList<MyData>();13 14 @Override15 protected void onCreate(Bundle savedInstanceState) {16 super.onCreate(savedInstanceState);17 setContentView(R.layout.activity_main);18 initData();19 MyDataAdapter adapter = new MyDataAdapter(MainActivity.20 this,R.layout.data_item,dataList);21 ListView listView = (ListView)findViewById(R.id.list_view);22 listView.setAdapter(adapter);23 }24 25 private void initData()26 {27 MyData t1 = new MyData("你真调皮,来,别BB",R.mipmap.t1);28 MyData t2 = new MyData("你真调皮,来,别BB",R.mipmap.t2);29 MyData t3 = new MyData("你真调皮,来,别BB",R.mipmap.t3);30 MyData t4 = new MyData("你真调皮,来,别BB",R.mipmap.t4);31 MyData t5 = new MyData("你真调皮,来,别BB",R.mipmap.t5);32 MyData t6 = new MyData("你真调皮,来,别BB",R.mipmap.t6);33 MyData t7 = new MyData("你真调皮,来,别BB",R.mipmap.t7);34 MyData t8 = new MyData("你真调皮,来,别BB",R.mipmap.t8);35 36 dataList.add(t1);37 dataList.add(t2);38 dataList.add(t3);39 dataList.add(t4);40 dataList.add(t5);41 dataList.add(t6);42 dataList.add(t7);43 dataList.add(t8);44 45 46 }47 }
原标题:初探ListView
关键词:ie