标签:des android style blog http io ar color os
一、图片查看器和网页源码查看器
在输入地址的是不能输入127.0.0.1 或者是 localhost.
ScrollView :可以看成一个滚轴 可以去包裹很多的控件在里面
练习1(图片查看器):
package com.shellway.imagelooker; import java.io.IOException; import java.io.InputStream; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import org.apache.http.conn.ConnectTimeoutException; import android.support.v7.app.ActionBarActivity; import android.annotation.SuppressLint; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.os.Bundle; import android.os.StrictMode; import android.view.View; import android.widget.EditText; import android.widget.ImageView; import android.widget.Toast; public class MainActivity extends ActionBarActivity { private EditText path; private ImageView iv; @SuppressLint("NewApi") @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); path = (EditText) findViewById(R.id.et_path); iv = (ImageView) findViewById(R.id.iv_image); StrictMode.ThreadPolicy policy=new StrictMode.ThreadPolicy.Builder().permitAll().build(); StrictMode.setThreadPolicy(policy); } public void onLook(View view){ String spath = path.getText().toString(); System.out.println(spath); if(spath.equals("")){ Toast.makeText(this, "输入的地址为空", Toast.LENGTH_SHORT).show(); }else { try { URL url = new URL(spath); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setRequestMethod("GET"); conn.setConnectTimeout(5000); if(conn.getResponseCode() == 200){ InputStream is = conn.getInputStream(); Bitmap bm = BitmapFactory.decodeStream(is); if(bm == null){ Toast.makeText(this, "获取的图片流为空", Toast.LENGTH_SHORT).show(); }else{ iv.setImageBitmap(bm); } }else{ Toast.makeText(this, "输入的路径不存在", Toast.LENGTH_SHORT).show(); } } catch (Exception e) { e.printStackTrace(); if(e instanceof MalformedURLException){ Toast.makeText(this, "输入的路径格式错误", Toast.LENGTH_SHORT).show(); }else if(e instanceof ConnectTimeoutException){ Toast.makeText(this, "连接超时错误", Toast.LENGTH_SHORT).show(); }else if(e instanceof IOException){ Toast.makeText(this, "获取数据错误", Toast.LENGTH_SHORT).show(); }else{ Toast.makeText(this, "未知错误", Toast.LENGTH_SHORT).show(); } } } } }
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.shellway.imagelooker" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="21" /> <uses-permission android:name="android.permission.INTERNET"/> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
练习2(网页源码查看器):
package com.shellway.htmllooker; import java.io.ByteArrayOutputStream; import java.io.InputStream; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import org.apache.http.client.utils.URIUtils; import android.support.v7.app.ActionBarActivity; import android.text.TextUtils; import android.annotation.SuppressLint; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.os.StrictMode; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.webkit.URLUtil; import android.widget.EditText; import android.widget.ImageView; import android.widget.TextView; import android.widget.Toast; public class MainActivity extends ActionBarActivity { protected static final int CHANGE_UI = 1; private EditText et_path; private TextView iv; private String path; // private Handler handler; @SuppressLint("NewApi") @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); et_path = (EditText) findViewById(R.id.et_path); iv = (TextView) findViewById(R.id.iv_image); /* handler = new Handler(){ public void handleMessage(Message msg) { if(msg.what == CHANGE_UI){ String s = (String) msg.obj; iv.setText(s); } }; };*/ StrictMode.ThreadPolicy policy=new StrictMode.ThreadPolicy.Builder().permitAll().build(); StrictMode.setThreadPolicy(policy); } public void onLook(View view){ path = et_path.getText().toString().trim(); if(TextUtils.isEmpty(path)){ Toast.makeText(MainActivity.this, "您输入的地址为空", Toast.LENGTH_SHORT).show(); }else{ // new Thread(){ // public void run() { try { URL url = new URL(path); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setRequestMethod("GET"); conn.setConnectTimeout(5000); if(conn.getResponseCode()==200){ InputStream is = conn.getInputStream(); ByteArrayOutputStream bos = new ByteArrayOutputStream(); byte[] buffer = new byte[1024]; int len=0 ; while((len = is.read(buffer))!=-1){ bos.write(buffer, 0, len); } String text =bos.toString(); bos.close(); is.close(); // Message msg = new Message(); // msg.what = CHANGE_UI; // msg.obj = text; // handler.sendMessage(msg); iv.setText(text); } } catch (Exception e) { e.printStackTrace(); } // }; // }.start(); } } }
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.shellway.htmllooker" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="21" /> <uses-permission android:name="android.permission.INTERNET"/> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
二、网易新闻客户端
1.对抓取的数据进行一个描述,我们用的是xml文件来进行描述,如:
<HeaderNews>
<HeaderNew>
<image>httP://192.168.1.101:8080/web/a.jpg<image>
<title>女子花3万相亲</title>
<content>婚介所向其介绍男友后消失<content>
<count>44跟帖</count>
</HeaderNew>
</HeaderNews>
首先数据是动态的。我们可以用servlet(查询数据库里面的数据) - 然后传递数据 通过request(转发)--> jsp 显示
findViewById() 直接使用是在我们的activity的布局里面去查找
注意:流被使用过之后,就不能再次使用。
json 轻量级的 数组 [{image:"httP://192.168.1.101:8080/web/a.jpg",title:"",content:"",count:""},{}]
ISO-8859-1 utf-8
get请求:把要提交的数据直接添加到路径的后面,
由于服务器对请求路径的长度是有限制的。最大不能超过4k,截取数据导致数据不完整。
post请求:
android系统引入了一个三方的框架 HttpClient 他就是对http协议的一个封装
文件上传:我们使用三方开源框架upload
在android端我们也使用HttpClient来实现文件的上传:HttpClient的版本必须在3.0之上。
电话归属地查询:
android server(webservice)
webservice:网络上的api
Bitmap BitmapFactory
ScrollView
Http : URL HttpURLConnection conn 联网权限
xml
json
http get /post
HttpClient
文件上传
注意啦:本页还没完善,后续会更新。。。。。。
标签:des android style blog http io ar color os
原文地址:http://www.cnblogs.com/shellway/p/4151671.html