一般在开发中我们都需要在listview中添加数据显示在界面上
1.首先我们会在布局中写一个listview
1 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" 2 xmlns:tools="http://schemas.android.com/tools" 3 android:layout_width="match_parent" 4 android:layout_height="match_parent" 5 android:background="#EFEFF4" 6 android:clipChildren="false" 7 > 8 9 <ListView 10 android:id="@+id/id_rada_list" 11 android:layout_width="match_parent" 12 android:layout_height="match_parent" 13 android:layout_marginTop="10dp" 14 android:divider="#00000000"/> 15 16 17 </FrameLayout>
2.初始化listview的布局控件
ListView rada_list = findViewById(R.id.id_rada_list);
3.网络请求数据在listview中加载adapter
rada_list.setAdapter(new MyListAdapter());
4.关键步骤adapter添加数据
//listview 设置适配器
class MyListAdapter extends BaseAdapter {
private DisplayImageOptions options;
public MyListAdapter() {
options = new DisplayImageOptions.Builder()
.showImageOnLoading(R.drawable.logo)//加载中图片的设置
.showImageForEmptyUri(R.drawable.logo)//url为null的情况下
.showImageOnFail(R.drawable.logo)//加载图片失败的时候的设置
.cacheInMemory(true)//是否缓存在内存
.cacheOnDisk(true)//是否缓存在硬盘
.considerExifParams(true)//exif:一张图片的附加信息 位置信息、时间信息、角度
.displayer(new FadeInBitmapDisplayer(500))//设置展示器
.build();
}
@Override
public int getCount() {
return redEnvelope.size();
}
@Override
public Object getItem(int position) {
return redEnvelope.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if (convertView == null) {
convertView = View.inflate(getApplication(), R.layout.item_radar, null);
holder = new ViewHolder();
holder.ivImageview = convertView.findViewById(R.id.iv_rade_image);
holder.tvName = convertView.findViewById(R.id.tv_name);
holder.tvMonkey = convertView.findViewById(R.id.tv_money);
holder.tvNuber = convertView.findViewById(R.id.tv_nuber);
holder.btCome = convertView.findViewById(R.id.bt_come);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.tvName.setText(redEnvelope.get(position).getNickname() + "");
DecimalFormat format = new DecimalFormat("#.##");
double aAmount = redEnvelope.get(position).getActualAmount();
holder.tvMonkey.setText(format.format(aAmount));
holder.tvNuber.setText(redEnvelope.get(position).getNumber() + "");
String photoUrl = redEnvelope.get(position).getPhotoUrl();
// String url = GlobalConstants.URL_PREFIX + news.get(position).listimage;
ImageLoader.getInstance().displayImage(photoUrl, holder.ivImageview, options);
holder.btCome.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {//点击红包雷达 去抢红包
if(redNum == 0){
DialogBuilder.messageDialog(RadarActivity.this).setMessage("您的抢红包次数已使用完啦!!!").show();
return;
}
nickname = redEnvelope.get(position).getNickname();
photoUrl1 = redEnvelope.get(position).getPhotoUrl();
actualAmount = redEnvelope.get(position).getActualAmount();
id = redEnvelope.get(position).getId();
number = redEnvelope.get(position).getNumber();
pos = position;
toValidate();
}
});
return convertView;
}
}
//非静态内部类会默认拥有外部类的实例对象
static class ViewHolder {
public ImageView ivImageview;
public TextView tvName;
public TextView tvMonkey;
public TextView tvNuber;
public Button btCome;
}
6.adtpter布局文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:orientation="vertical">
<LinearLayout
android:id="@+id/ll_pay_wx"
android:layout_width="match_parent"
android:layout_height="80dp"
android:layout_marginLeft="16dp"
android:background="#FFFFFF"
android:layout_marginRight="13dp"
android:gravity="center_vertical">
<com.netease.nim.avchatkit.common.imageview.CircleImageView
android:id="@+id/iv_rade_image"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
app:civ_border_color="#fffed470"
app:civ_border_width="2dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="@+id/constraintLayout"
app:srcCompat="@drawable/logo" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="17dp"
android:orientation="vertical">
<TextView
android:id="@+id/tv_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="2dp"
android:text="红聊科技
" android:textColor="#000000"
android:textSize="15sp"/>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<TextView
android:id="@+id/tv_read_yuer"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#666666"
android:textSize="13sp"
android:text="剩余"/>
<TextView
android:id="@+id/tv_money"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="@+id/tv_read_yuer"
android:text="1000"
android:textSize="13sp"
android:textColor="#ff533c"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="@+id/tv_money"
android:text="元"
android:textSize="13sp"
android:textColor="#666666"/>
<TextView
android:id="@+id/tv_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="90dp"
android:textSize="13sp"
android:textColor="#666666"
android:text="剩余"/>
<TextView
android:id="@+id/tv_nuber"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="@+id/tv_view"
android:text="10"
android:textSize="13sp"
android:textColor="#666666"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="@+id/tv_nuber"
android:text="个红包"
android:textSize="13sp"
android:textColor="#666666"/>
</RelativeLayout>
<Button
android:id="@+id/bt_come"
android:layout_width="73dp"
android:layout_height="27dp"
android:layout_marginLeft="170dp"
android:layout_marginTop="-22dp"
android:textColor="#504f4f"
style="?android:attr/borderlessButtonStyle"
android:background="@drawable/shape_backgroundd"
android:text="去抢"/>
</LinearLayout>
</LinearLayout>
<View
android:layout_width="match_parent"
android:layout_height="1dip"
android:layout_marginLeft="16dp"
android:layout_marginRight="13dp"
android:background="#E0E0E0"/>
</LinearLayout>