Android调用Restfull

最新推荐文章于 2024-07-10 03:14:42 发布

madun

最新推荐文章于 2024-07-10 03:14:42 发布

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文章标签： android string button null query url

本文链接：https://blog.youkuaiyun.com/madun/article/details/6575227

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本文介绍如何在Android应用中调用RESTful API。通过创建一个简单的Android Activity，使用HttpClinet发送GET请求，并携带参数，实现了从指定URL获取数据。在请求中添加了deviceId头信息，并处理了可能的异常情况。

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package com.example.android;
import java.io.IOException;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.ResponseHandler;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
public class AndroidApp extends Activity {
String URL = "http://the/url/here";
InputStream is = null;
String result = "";
String deviceId = "xxxxx" ;
final String tag = "Your Logcat tag: ";
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final EditText txtSearch = (EditText)findViewById(R.id.txtSearch);
txtSearch.setOnClickListener(new EditText.OnClickListener(){
public void onClick(View v){txtSearch.setText("");}
});
final Button btnSearch = (Button)findViewById(R.id.btnSearch);
btnSearch.setOnClickListener(new Button.OnClickListener(){
public void onClick(View v) {
String query = txtSearch.getText().toString();
callWebService(query);
}
});
} // end onCreate()
public void callWebService(String q){
HttpClient httpclient = new DefaultHttpClient();
HttpGet request = new HttpGet(URL + q);
request.addHeader("deviceId", deviceId);
         final List<BasicNameValuePair> dataList = new ArrayList<BasicNameValuePair>();
         dataList.add(new BasicNameValuePair("abc", "abc"));
         dataList.add(new BasicNameValuePair("def", "def"));
         HttpEntity entity = new UrlEncodedFormEntity(dataList, "UTF-8");
         request.setEntity(entity);
try {
HttpResponse resp = httpclient.execute(request);
            is = resp.getEntity().getContent();
            if (is != null) {
            String line;
            BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));
            while ((line = reader.readLine()) != null) {
              sb.append(line).append("/n");
            }
            }
            String ret = sb.toString();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
httpclient.getConnectionManager().shutdown();
Log.i(tag, result);
}