android 简单网络图片查看器 HttpURLConnection

package com.example.alltest;

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


public class MainActivity extends Activity {
		
		private EditText et_path;
		private ImageView iv;
		
	    @Override
	    public 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) throws IOException{
	    	String path = et_path.getText().toString();
	    	if(path.equals("")){
	    		Toast.makeText(this, "图片的路径为空", 1).show();
	    	}else{
					// 构建路径
					URL url = new URL(path);
					//打开连接
					HttpURLConnection conn = (HttpURLConnection) url.openConnection();
					//请求方式
					conn.setRequestMethod("GET");
					//超时时间
					conn.setConnectTimeout(5000);
					if(conn.getResponseCode() == 200){
						InputStream is = conn.getInputStream();
						
						//把流转化为图片
						Bitmap bitmap = BitmapFactory.decodeStream(is);
						if(bitmap == null){
							Toast.makeText(this, "获取的图片流为空", 1).show();
						}else{
							iv.setImageBitmap(bitmap);
						}
					}else{
						Toast.makeText(this, "输入的路径不存在", 1).show();
					}
	    	}
	    }
	}

AndroidManifest.xml  (当minSdkVersion="8"时，Android2.3 和Android4.0.4都可以运行，但是minSdkVersion="10"时，Android2.3 可以运行，Android4.0.4不可以，不知道为什么原因，请大神解惑）

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.alltest"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="8" />
    <!-- 联网权限 -->
    <uses-permission android:name="android.permission.INTERNET"/>

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:label="@string/app_name"
            android:name=".MainActivity" >
            <intent-filter >
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>
<!-- 
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.alltest"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />
    <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="com.example.alltest.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>
 -->