Android测试Handler的基本使用 _android

弱龄寄事外，委怀在琴书。这篇文章主要讲述Android测试Handler的基本使用相关的知识，希望能为你提供帮助。

package com.sherlock.app_handler; import java.io.ByteArrayOutputStream; import java.io.InputStream; import java.net.HttpURLConnection; import java.net.URL; import android.app.Activity; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.view.View; import android.widget.EditText; import android.widget.ProgressBar; /*** * 测试Handler的基本使用 * @author sherlock 1. 创建Handler成员变量对象, 并重写其handleMessage() 2. 在分/主线程创建Message对象 3. 使用handler对象发送Message 4. 在handleMessage()中处理消息 */ public class HandlerTestActivity extends Activity { private ProgressBar pb_handler1_loading; private EditText et_handler1_result; //1. 创建Handler成员变量对象, 并重写其handleMessage() private Handler handler = new Handler(){ public void handleMessage(android.os.Message msg) {//在主线程执行 if(msg.what == 1) { //4. 在handleMessage()中处理消息 String result = (String) msg.obj; et_handler1_result.setText(result); pb_handler1_loading.setVisibility(View.INVISIBLE); } } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_handler_test); pb_handler1_loading = (ProgressBar) findViewById(R.id.pb_handler1_loading); et_handler1_result = (EditText) findViewById(R.id.et_handler1_result); } /* 1. 主线程, 显示提示视图(ProgressDialog/ProgressBar) 2. 分线程, 联网请求, 并得到响应数据 3. 主线程, 显示数据/隐藏提示视图 */ public void getSubmit1(View v) { //1. 主线程, 显示提示视图(ProgressDialog/ProgressBar) pb_handler1_loading.setVisibility(View.VISIBLE); //2. 分线程, 联网请求, 并得到响应数据 new Thread(){ public void run() { String path = "http://192.168.3.18:8080/SSH/client/json/myFile_search.shtml?name=Tom& age=12"; try { final String result = requestToString(path); //3. 主线程, 显示数据 runOnUiThread(new Runnable() { @Override public void run() { et_handler1_result.setText(result); pb_handler1_loading.setVisibility(View.INVISIBLE); } }); } catch (Exception e) { e.printStackTrace(); } } }.start(); } public void getSubmit2(View v) { //1). 主线程, 显示提示视图(ProgressDialog/ProgressBar) pb_handler1_loading.setVisibility(View.VISIBLE); //2). 分线程, 联网请求, 并得到响应数据 new Thread(){ public void run() { String path = "http://192.168.3.18:8080/SSH/client/json/myFile_search.shtml?name=Tom& age=12"; try { String result = requestToString(path); //3). 主线程, 显示数据 //2. 在分/主线程创建Message对象 Message message = Message.obtain(); message.what = 1; //标识 message.obj = result; //3. 使用handler对象发送Message handler.sendMessage(message); } catch (Exception e) { e.printStackTrace(); } } }.start(); } /** * 请求服务器端, 得到返回的结果字符串 * @param path: * @throws Exception */ public String requestToString(String path) throws Exception { URL url = new URL(path); HttpURLConnection connection = (HttpURLConnection) url.openConnection(); connection.setConnectTimeout(5000); connection.setReadTimeout(5000); connection.connect(); InputStream is = connection.getInputStream(); ByteArrayOutputStream baos = new ByteArrayOutputStream(); byte[] buffer = new byte[1024]; int len = -1; while ((len = is.read(buffer)) != -1) { baos.write(buffer, 0, len); } baos.close(); is.close(); String result = baos.toString(); connection.disconnect(); return result; }}

【Android测试Handler的基本使用】