新浪微博随便看看 android模拟

模拟新浪微博-随便看看

我们在使用android应用的时候，看到的listview效果经常也会看到图片和文字共存的情况。比如新狼微博中别人发布的消息



首先，我们用到布局，第一个横向的LinearLayout定义基本的item布局，其中包括了一个imageview和一个垂直的RelativeLayout

有3个Textview。用于显示列表每一行的文本和图片

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<span style="font-size:14px;"><?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"
android:orientation="horizontal" >

<ImageView
android:id="@+id/one1"
android:layout_width="70dp"
android:layout_height="70dp"
android:layout_marginLeft="3dp"
android:src="@drawable/one" />

<RelativeLayout
android:layout_width="200dp"
android:layout_height="150dip"
android:layout_margin="15dip"
android:layout_marginTop="2dp"
android:layout_weight="0.23" >

<TextView
android:id="@+id/name"
android:layout_width="100dp"
android:layout_height="wrap_content"

android:text="@string/user" />

<TextView
android:id="@+id/time"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_marginRight="14dp"
android:textColor="#00FF00"
android:text="1"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="@+id/one2"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_below="@+id/time"
android:text="@string/content" />

</RelativeLayout>

</span><p><span style="font-size:14px;"> < /LinearLayout></span></p><p><span style="font-size:14px;"> </span></p><p><span style="font-size:14px;">然后用<span style="font-family:Times New Roman;">ArrayAdapter(Context context, int textViewResourceId,List<One>one) {</span><span style="font-family:微软雅黑;">来装配数据，要装配这些数据就需要一个连接</span><span style="font-family:Times New Roman;">ListView</span><span style="font-family:微软雅黑;">视图对象和数组数据的适配器来两者的适配工作，</span><span style="font-family:Times New Roman;">ArrayAdapter</span><span style="font-family:微软雅黑;">的构造需要三个参数，依次为</span><span style="font-family:Times New Roman;">this,</span><span style="font-family:微软雅黑;">布局文件（注意这里的布局文件描述的是列表的每一行的布局，</span><span style="font-family:Times New Roman;">android.R.layout.simple_list_item_1</span><span style="font-family:微软雅黑;">是系统定义好的布局文件只显示一行文字，数据源</span><span style="font-family:Times New Roman;">(</span><span style="font-family:微软雅黑;">一个</span><span style="font-family:Times New Roman;">List</span><span style="font-family:微软雅黑;">集合</span><span style="font-family:Times New Roman;">)</span></span><span style="font-family:微软雅黑;"><span style="font-size:14px;">。。</span></span></p><pre class="html" name="code"><span style="font-size:14px;">public class oneAdapter extends ArrayAdapter{

//我们新增了一个内部类ViewHolder，用于对控件的实例进行缓存。
//当convertView为空的时候，创建一个ViewHolder对象，并将控件的实例都存放在ViewHolder里，然后调用View的setTag()方法，将ViewHolder对象存储在View中。
//当convertView不为空的时候则调用View的getTag()方法，把ViewHolder重新取出。
//这样所有控件的实例都缓存在了ViewHolder里，就没有必要每次都通过findViewById()方法来获取控件实例了
private int resourceId;
public oneAdapter(Context context, int textViewResourceId,List<One>one) {
super(context, textViewResourceId,one);

resourceId = textViewResourceId;
// TODO Auto-generated constructor stub
}

// 这个方法在每个子项被滚动到屏幕内的时候会被调用
// getView()方法中还有一个convertView参数，这个参数用于将之前加载好的布局进行缓存，以便之后可以进行重用
public View getView(int position, View convertView, ViewGroup parent) {
One one = (One) getItem(position);
View view = null;
ViewHolder viewHolder;
if (convertView == null) {
view = LayoutInflater.from(getContext()).inflate(resourceId, null);
viewHolder = new ViewHolder();

viewHolder.one1 = (ImageView) view.findViewById(R.id.one1);
viewHolder.one2 = (TextView) view.findViewById(R.id.one2);

viewHolder.time= (TextView) view.findViewById(R.id.time);
viewHolder.name = (TextView) view.findViewById(R.id.name);
view.setTag(viewHolder);
} else {
view = convertView;
viewHolder = (ViewHolder) convertView.getTag();
}
viewHolder.one1.setImageResource(one.getImageId());
viewHolder.name.setText(one.getName());
viewHolder.time.setText(one.getTime());
viewHolder.one2.setText(one.getContent());
return view;
}

class ViewHolder {

ImageView one1;
TextView time;
TextView name;
TextView one2;

}

}</span>

<span style="font-size:14px;"><?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"
    android:orientation="horizontal" >

    <ImageView
        android:id="@+id/one1"
        android:layout_width="70dp"
        android:layout_height="70dp"
        android:layout_marginLeft="3dp"
        android:src="@drawable/one" />

    <RelativeLayout
        android:layout_width="200dp"
        android:layout_height="150dip"
        android:layout_margin="15dip"
        android:layout_marginTop="2dp"
        android:layout_weight="0.23" >

        <TextView
            android:id="@+id/name"
            android:layout_width="100dp"
            android:layout_height="wrap_content"
           
            android:text="@string/user" />
        
       
          <TextView
        android:id="@+id/time"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:layout_marginRight="14dp"
        android:textColor="#00FF00"
        android:text="1"
        android:textAppearance="?android:attr/textAppearanceMedium" />
           <TextView
            android:id="@+id/one2"
            android:layout_width="200dp"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_alignParentLeft="true"
              android:layout_below="@+id/time"
            android:text="@string/content" />
          
        
        
    </RelativeLayout>

</span><p><span style="font-size:14px;"> < /LinearLayout></span></p><p><span style="font-size:14px;"> </span></p><p><span style="font-size:14px;">然后用<span style="font-family:Times New Roman;">ArrayAdapter(Context context, int textViewResourceId,List<One>one) {</span><span style="font-family:微软雅黑;">来装配数据，要装配这些数据就需要一个连接</span><span style="font-family:Times New Roman;">ListView</span><span style="font-family:微软雅黑;">视图对象和数组数据的适配器来两者的适配工作，</span><span style="font-family:Times New Roman;">ArrayAdapter</span><span style="font-family:微软雅黑;">的构造需要三个参数，依次为</span><span style="font-family:Times New Roman;">this,</span><span style="font-family:微软雅黑;">布局文件（注意这里的布局文件描述的是列表的每一行的布局，</span><span style="font-family:Times New Roman;">android.R.layout.simple_list_item_1</span><span style="font-family:微软雅黑;">是系统定义好的布局文件只显示一行文字，数据源</span><span style="font-family:Times New Roman;">(</span><span style="font-family:微软雅黑;">一个</span><span style="font-family:Times New Roman;">List</span><span style="font-family:微软雅黑;">集合</span><span style="font-family:Times New Roman;">)</span></span><span style="font-family:微软雅黑;"><span style="font-size:14px;">。。</span></span></p><pre class="html" name="code"><span style="font-size:14px;">public class oneAdapter  extends ArrayAdapter{

    //我们新增了一个内部类ViewHolder，用于对控件的实例进行缓存。
        //当convertView为空的时候，创建一个ViewHolder对象，并将控件的实例都存放在ViewHolder里，然后调用View的setTag()方法，将ViewHolder对象存储在View中。
        //当convertView不为空的时候则调用View的getTag()方法，把ViewHolder重新取出。
        //这样所有控件的实例都缓存在了ViewHolder里，就没有必要每次都通过findViewById()方法来获取控件实例了
    private int resourceId;
    public oneAdapter(Context context, int textViewResourceId,List<One>one) {
        super(context, textViewResourceId,one);
        
        resourceId = textViewResourceId;
        // TODO Auto-generated constructor stub
    }

    // 这个方法在每个子项被滚动到屏幕内的时候会被调用
    // getView()方法中还有一个convertView参数，这个参数用于将之前加载好的布局进行缓存，以便之后可以进行重用
    public View getView(int position, View convertView, ViewGroup parent) {
        One one = (One) getItem(position);
        View view = null;
        ViewHolder viewHolder;
        if (convertView == null) {
            view = LayoutInflater.from(getContext()).inflate(resourceId, null);
            viewHolder = new ViewHolder();
        
            viewHolder.one1 = (ImageView) view.findViewById(R.id.one1);
            viewHolder.one2 = (TextView) view.findViewById(R.id.one2);
            
            viewHolder.time= (TextView) view.findViewById(R.id.time);
            viewHolder.name = (TextView) view.findViewById(R.id.name);
            view.setTag(viewHolder);
        } else {
            view = convertView;
            viewHolder = (ViewHolder) convertView.getTag();
        }
        viewHolder.one1.setImageResource(one.getImageId());
        viewHolder.name.setText(one.getName());
        viewHolder.time.setText(one.getTime());
        viewHolder.one2.setText(one.getContent());
        return view;
    }

    class ViewHolder {

        ImageView one1;
        TextView time;
        TextView name;
        TextView one2;
        

    }

}</span>

运行后的现实结构如下图

然后，在mainactivity中通过get方法得到数据

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public class MainActivity extends Activity {

private ListView one1;
private List<One> oneList = new ArrayList<One>();

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initOne();
one1 = (ListView) findViewById(R.id.lvnew);
oneAdapter adapter=new oneAdapter(this, R.layout.one_item,oneList);
one1.setAdapter(adapter);
one1.setOnItemClickListener(new OnItemClickListener() {

@Override
public void onItemClick(AdapterView<?> adpterView, View view, int position,
long id) {

One one = oneList.get(position);
Toast.makeText(MainActivity.this, one.getName(),
Toast.LENGTH_SHORT).show();

}
});
}

private void initOne() {
One sun = new One("丽丽", R.drawable.w1,"2分钟前","隔窗望月，清辉虽洒在我身上，我却离那幸福光耀的源头，千千万万里" );
One smile = new One("晴晴", R.drawable.w2,"12分钟前","选择最淡的心事，诠释坎坷的人生 ");
oneList.add(smile);
One smile1 = new One("盼盼", R.drawable.w3,"6分钟前","过去的一页，能不翻就不要翻，翻落了灰尘会迷了双眼");
oneList.add(smile1);
One smile2 = new One("琪琪", R.drawable.w4,"36分钟前","今天天气下雨了，心情不好");
oneList.add(smile2);
One smile3 = new One("贝贝", R.drawable.w5,"3分钟前","你的眼睛，是我永生不会再遇的海");
oneList.add(smile3);

}

public class MainActivity extends Activity {

private ListView one1;
private List<One> oneList = new ArrayList<One>();

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initOne();
one1 = (ListView) findViewById(R.id.lvnew);
oneAdapter adapter=new oneAdapter(this, R.layout.one_item,oneList);
one1.setAdapter(adapter);
one1.setOnItemClickListener(new OnItemClickListener() {

@Override
public void onItemClick(AdapterView<?> adpterView, View view, int position,
long id) {

One one = oneList.get(position);
Toast.makeText(MainActivity.this, one.getName(),
Toast.LENGTH_SHORT).show();

}
});
}

private void initOne() {
One sun = new One("丽丽", R.drawable.w1,"2分钟前","隔窗望月，清辉虽洒在我身上，我却离那幸福光耀的源头，千千万万里" );
One smile = new One("晴晴", R.drawable.w2,"12分钟前","选择最淡的心事，诠释坎坷的人生  ");
oneList.add(smile);
One smile1 = new One("盼盼", R.drawable.w3,"6分钟前","过去的一页，能不翻就不要翻，翻落了灰尘会迷了双眼");
oneList.add(smile1);
One smile2 = new One("琪琪", R.drawable.w4,"36分钟前","今天天气下雨了，心情不好");
oneList.add(smile2);
One smile3 = new One("贝贝", R.drawable.w5,"3分钟前","你的眼睛，是我永生不会再遇的海");
oneList.add(smile3);

}

最后效果如下：