AsyncHttpClient 和 SmartImageView 的使用
MainActivity
ListView 的 setOnItemClickListener() 方法
用于监听Item的点击事件 使用时 需要传入一个OnItemClickListener 实现类对象 且需要实现onItemClick() 方法
ListView 的 setSelection() 方法
设置当前选中的条目
public class MainActivity extends AppCompatActivity {
ListView lv_news;
LinearLayout Loading;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lv_news = (ListView) findViewById(R.id.lv_news);
Loading = (LinearLayout) findViewById(R.id.loading);
fillData3();
}
private void fillData3() {
System.out.println(">>>>>>>>>>>>>执行了");
AsyncHttpClient asynchttpClient = new AsyncHttpClient();
asynchttpClient.get("http://10.61.19.112:8080/NewsInfo.json", new AsyncHttpResponseHandler() {
@Override
public void onSuccess(int i, org.apache.http.Header[] headers, byte[] bytes) {
try {
String json = new String(bytes, "utf-8");
List newsInfos = JsonParse.getNewsInfo(json);
if (newsInfos == null) {
Toast.makeText(MainActivity.this, "解析失败!", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(MainActivity.this, "获取成功!", Toast.LENGTH_SHORT).show();
Loading.setVisibility(View.INVISIBLE);
lv_news.setAdapter(new newsAdapter(MainActivity.this, newsInfos));
}
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
@Override
public void onFailure(int i, org.apache.http.Header[] headers, byte[] bytes, Throwable throwable) {
System.out.println(">>>>>>>>>获取失败!");
}
});
}
}
newsInfo类
定义了 IconPath 图片路径 新闻标题 描述 等等描述
public class newsInfo {
private String icon;
private String title;
private String content;
private int type;
private long comment;
public String getIcon() {
return icon;
}
public void setIcon(String icon) {
this.icon = icon;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
public int getType() {
return type;
}
public void setType(int type) {
this.type = type;
}
public long getComment() {
return comment;
}
public void setComment(long comment) {
this.comment = comment;
}
}
JsonParse类
android
public class JsonParse {
public static List getNewsInfo(String json){
Gson gson =new Gson();
Type listType = new TypeToken>(){
}.getType();
List newsInfos = gson.fromJson(json,listType);
return newsInfos;
}
}
newsAdapter类
android
public class newsAdapter extends ArrayAdapter{
public newsAdapter(Context context, List objects) {
super(context, R.layout.news_item , objects);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
newsInfo news= getItem(position);
View view;
ViewHolder viewHolder;
if (convertView == null) {
//任务 补充完整
view = LayoutInflater.from(getContext()).inflate(R.layout.news_item, null);
viewHolder = new ViewHolder();
//获取控件
viewHolder.siv = (SmartImageView) view.findViewById(R.id.siv_icon);
viewHolder.tvtitle = (TextView) view.findViewById(R.id.tv_title);
viewHolder.tvdescription = (TextView) view.findViewById(R.id.tv_description);
viewHolder.tvtype = (TextView) view.findViewById(R.id.tv_type);
view.setTag(viewHolder);
} else {
view = convertView;
viewHolder = (ViewHolder) view.getTag();
}
viewHolder.siv.setImageUrl(news.getIcon());
viewHolder.tvtitle.setText(news.getTitle());
viewHolder.tvdescription.setText(news.getContent());
viewHolder.tvtype.setText(news.getType()+"");
return view;
}
class ViewHolder {
SmartImageView siv;
TextView tvtitle;
TextView tvdescription;
TextView tvtype;
}
}
Activity_main.xml
android
<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"
tools:context=".MainActivity"
android:orientation="vertical">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:id="@+id/loading"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical"
android:visibility="invisible">
<ProgressBar
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="正在加载信息..." />
LinearLayout>
<ListView
android:id="@+id/lv_news"
android:layout_width="match_parent"
android:layout_height="match_parent" />
FrameLayout>
LinearLayout>
*news_item.xml
TextView用于显示数据库中的某条数据的详细信息
ImageView用于增加减少金额和删除金额
android
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="65dp">
<com.loopj.android.image.SmartImageView
android:id="@+id/siv_icon"
android:layout_width="80dp"
android:layout_height="60dp"
android:scaleType="centerCrop"
android:src="@mipmap/ic_launcher"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true">com.loopj.android.image.SmartImageView>
<TextView
android:id="@+id/tv_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:layout_marginTop="10dp"
android:layout_toRightOf="@id/siv_icon"
android:ellipsize="end"
android:maxLength="20"
android:singleLine="true"
android:text="我是标题"
android:textColor="#000000"
android:textSize="18sp" />
<TextView
android:id="@+id/tv_description"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/tv_title"
android:layout_marginLeft="5dp"
android:layout_marginTop="5dp"
android:layout_toRightOf="@id/siv_icon"
android:ellipsize="end"
android:maxLength="16"
android:maxLines="1"
android:text="我是描述"
android:textColor="#99000000"
android:textSize="14sp" />
<TextView
android:id="@+id/tv_type"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_marginBottom="5dp"
android:layout_marginRight="10dp"
android:text="评论"
android:textColor="#99000000"
android:textSize="12sp" />
RelativeLayout>