在安卓中我们使用HttpURLConnection来进行请求

我们看主activity的代码:public class TestHttpActivity extends Activity implements AdapterView.OnItemClickListener {

public static final String TAG = TestHttpActivity.class.getSimpleName();

private ArrayList mBookArrayList;

private BookMainAdapter mBookMainAdapter;

public static void startActivity(Context context) {

Intent intent = new Intent();

intent.setClass(context,TestHttpActivity.class);

context.startActivity(intent);

}

@Override

protected void onCreate(@Nullable Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.feeds_main);

initTitle();

ListView listView = (ListView) findViewById(R.id.news_home_listview);

mBookMainAdapter = new BookMainAdapter(this);

listView.setAdapter(mBookMainAdapter);

listView.setOnItemClickListener(this);

}

@Override

protected void onResume() {

super.onResume();

new InitDataAsyncTask().execute();

}

private void initTitle() {

TitleBarCommon titleBarCommon = (TitleBarCommon)findViewById(R.id.head_common_layout);

titleBarCommon.setRightTextViewString("增加");

titleBarCommon.setRightTextViewListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

BookDetail.startActivity(TestHttpActivity.this,null);

}

});

}

private class InitDataAsyncTask extends AsyncTask {

@Override

protected Void doInBackground(Void... params) {

HttpUtil httpUtil = new HttpUtil();

String url = "http://139.199.89.89/api/v1/books";

String response = httpUtil.get(TestHttpActivity.this,url);

Log.d(TAG,"response="+response);

parseResponse(response);

return null;

}

@Override

protected void onPostExecute(Void aVoid) {

super.onPostExecute(aVoid);

Log.d(TAG,"<<<<

mBookMainAdapter.setList(mBookArrayList);

}

}

private void parseResponse(String response) {

try{

Gson gson = new Gson();

JSONArray jsonArray = new JSONArray(response);

ArrayList books;

mBookArrayList = new Gson().fromJson(response, new TypeToken>(){}.getType());

}catch (Exception ex) {

ex.printStackTrace();

}

}

@Override

public void onItemClick(AdapterView> parent, View view, int position, long id) {

Book book = mBookArrayList.get(position);

BookDetail.startActivity(TestHttpActivity.this,book);

}

}

注意所有的网络请求都要放到子线程中，不然会报错

xml：<?xml  version="1.0" encoding="utf-8"?>

xmlns:app="http://schemas.android.com/apk/res-auto"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:background="@color/white_a"

xmlns:tools="http://schemas.android.com/tools"

android:orientation="vertical">

android:id="@+id/head_common_layout"

android:layout_width="match_parent"

android:layout_height="44dp"

android:background="@color/red_bn"

android:gravity="center_vertical"/>

android:id="@+id/news_home_listview"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:divider="@null"

android:fadingEdge="none"

android:footerDividersEnabled="true"

android:listSelector="@color/trans_color"

android:scrollbars="none"

android:scrollingCache="false" />

看Get操作:public String get(Context context, final String strUrl) {

URL getUrl = null;

try {

getUrl = new URL(strUrl);

} catch (MalformedURLException ex) {

Log.e("HttpUtil", "get MalformedURL", ex);

return null;

}

InputStream input = null;

ByteArrayOutputStream byteOutStream = null;

HttpURLConnection conn = null;

byte[] outData = null;

try {

conn = getConnection(context, getUrl);

connection = conn;

conn.setConnectTimeout(TIMEOUT);

conn.setReadTimeout(TIMEOUT);

conn.setDoInput(true);

conn.connect();

input = conn.getInputStream();

String webcontent = null;

byteOutStream = new ByteArrayOutputStream();

//byte[] buf = new byte[BUF_LEN];

int i = 0;

while((i = input.read(tmpBuf)) != -1){

byteOutStream.write(tmpBuf, 0, i);

}

outData = byteOutStream.toByteArray();

if(outData != null && outData.length > 0){

webcontent = new String(outData);

}

return webcontent;

} catch (Exception ex) {

Log.e("HttpUtil", "get", ex);

//return ex.getMessage();

} finally {

try{

outData = null;

if(input != null){

input.close();

input = null;

}

if(byteOutStream != null){

byteOutStream.close();

byteOutStream = null;

}

if(conn != null){

conn.disconnect();

conn = null;

}

} catch(Exception ex){

Log.e("HttpUtil", "get finally", ex);

//return ex.getMessage();

}

}

return null;

}