图片查看器、网页源码查看器

这些代码应该在Android2.2版本上运行，高版本可能会出错

原理图：

1、图片查看器

package com.njupt.imagelooker7;

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

import android.os.Bundle;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageView;

public class MainActivity extends Activity {

	private EditText et_path;
	private ImageView iv;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		et_path = (EditText) findViewById(R.id.et_path);
		iv = (ImageView) findViewById(R.id.iv);
	}

	public void look(View v) {
		String path = et_path.getText().toString();

		try {
			URL url = new URL(path);//构建路径
			HttpURLConnection conn = (HttpURLConnection) url.openConnection();//打开连接
			
			conn.setRequestMethod("GET");//设置请求方法
			conn.setConnectTimeout(5000);//设置超时时间
			if(conn.getResponseCode() == 200){//根据返回码判断是否成功
				InputStream is = conn.getInputStream();
				Bitmap bitmap = BitmapFactory.decodeStream(is);//把流转化成图片
				if(bitmap != null){
					iv.setImageBitmap(bitmap);
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}

2、网页源码查看器

package com.njupt.htmllooker;

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

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends Activity {

	private EditText et_path;
	private TextView html_tv;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		et_path = (EditText) findViewById(R.id.et_path);
		html_tv = (TextView) findViewById(R.id.html_tv);
	}

	public void look(View v) {
		String path = et_path.getText().toString();

		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;
				
				//把流转化成文本信息
				while((len = is.read(buffer)) != -1){
					bos.write(buffer,0,len);
				}
				
				String html  = bos.toString();
				html_tv.setText(html);
				
				is.close();
				bos.close();
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}

3、以下附上界面的源码

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    
    <TextView 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="网页源码查看器"/>
    
    <EditText 
        android:id="@+id/et_path"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="http://192.168.1.101:8080/web/home.jsp"/>
    
    <Button 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="look"
        android:text="查看网页源码"/>
    
    <ScrollView android:layout_width="fill_parent"
        android:layout_height="fill_parent">
       <TextView 
        android:id="@+id/html_tv"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"/>    
        
    </ScrollView>
    

</LinearLayout>