Android 网络图片查看器与网页源码查看器

在AndroidManifest.xml里面先添加访问网络的权限：

<uses-permission android:name="android.permission.INTERNET"/>

效果图如下：

下面是主要代码：

package com.hb.neting;

import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends Activity {
    private ImageView iv_show;
    private EditText et_input;
    private String path;
    private int code;
    private HttpURLConnection conn;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        iv_show=(ImageView) findViewById(R.id.iv_show);
        et_input=(EditText) findViewById(R.id.et_inpput);
    }
    @SuppressLint("ShowToast") public void chakan(View view){
        path = et_input.getText().toString().trim();
        if (TextUtils.isEmpty(path)) {
            Toast.makeText(MainActivity.this, "不能输入空的", 0).show();
            return;
        }
        new Thread(){
            public void run() {
                try {
                    URL url = new URL(path);
                    conn = (HttpURLConnection) url.openConnection();
                    conn.setRequestMethod("GET");
                    conn.setConnectTimeout(5000);
                    code = conn.getResponseCode();
                    if(code==200){
                        InputStream in = conn.getInputStream();
                        //解析图片
                        final Bitmap stream = BitmapFactory.decodeStream(in);
                        runOnUiThread(new  Runnable() {
                            public void run() {
                                //更新UI
                                iv_show.setImageBitmap(stream);
                            }
                        });
                        in.close();
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
            };
        }.start();
    }
}

这是xml的布局：

<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"
    android:orientation="vertical" >

    <EditText
        android:id="@+id/et_inpput"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="请输入获取图片的地址：" />
    <Button 
        android:id="@+id/bt_read"
        android:onClick="chakan"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="查看"
        />
    <ImageView
        android:id="@+id/iv_show"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        />
</LinearLayout>

源码：http://pan.baidu.com/s/1bUgMgY

接着看一下网页源码查看器的小案例：

　　既然都涉及到网络的添加一个如上的网络权限是必不可少的了，具体操做如上所示，先看效果图：

主要代码：

package com.hb.network;

import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.text.TextUtils;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import com.hb.utils.ReadStreamUtils;

public class MainActivity extends Activity {
    protected static final int SUCESS = 0;
    protected static final int EORR = 1;
    private TextView tv_show; 
    private EditText et_input;
    private URL url;
    private String path;
    @SuppressLint("HandlerLeak") 
    private Handler handler=new Handler(){
        public void handleMessage(android.os.Message msg) {
            switch (msg.what) {
            case SUCESS:
                String content=(String) msg.obj;
                tv_show.setText(content);
                break;

            case EORR:
                Toast.makeText(MainActivity.this,"查看源码失败" , 0).show();
                break;
            }
        };
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv_show=(TextView) findViewById(R.id.tv_show);
        et_input=(EditText) findViewById(R.id.et_input);


    }
    public void onclick(View view){
        path = et_input.getText().toString().trim();
        if(TextUtils.isEmpty(path)){
            return;
        }new Thread(){
            public void run() {
                try {
                    url = new URL(path);
                    //判断从EditText获取的数据否为空
                    if(TextUtils.isEmpty(path)){
                        return;
                    }
                    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                    conn.setConnectTimeout(3000);
                    conn.setRequestMethod("GET");
                    int code = conn.getResponseCode();
                    if(code == 200){
                        InputStream is= conn.getInputStream();
                        String content = ReadStreamUtils.Read(is);
                        Message msg = new Message();
                        msg.what=SUCESS;
                        msg.obj=content;
                        handler.sendMessage(msg);
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                    Message msg = new Message();
                    msg.what=EORR;
                    handler.sendMessage(msg);
                }
            };
        }.start();

    }
}

package com.hb.utils;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class ReadStreamUtils {
/**
 * 读取流的输入
 * @param is
 * @return
 * @throws IOException
 */
    public static String Read(InputStream is) throws IOException{
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        int len;
        byte [] buffer=new byte[1024];
        while((len=is.read(buffer))!=-1){
            bos.write(buffer,0,len);
        }
        is.close();
        bos.close();
        String temp = bos.toString();
        if(temp.contains("charset=utf-8")){
            return bos.toString("utf-8");
        }else if(temp.contains("charset=iso-8859-1")){
            return bos.toString("iso-8859-1");
        }
        return null;
        
    }

}

及xml布局:

<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"
    android:orientation="vertical"
    tools:context="${relativePackage}.${activityClass}" >

    <EditText
        android:id="@+id/et_input"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="请输入要查看源码的网址：" />

    <Button
        android:onClick="onclick"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="查看"
        android:textSize="25sp" />

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <TextView
            android:id="@+id/tv_show"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />
    </ScrollView>

</LinearLayout>

　　源码：http://pan.baidu.com/s/1bUgMgY

　　　　　http://pan.baidu.com/s/1i46RQqL