Android(安卓)网络图片查看器

StreamTool：将InputStream转化为ByteArray

package util;import java.io.ByteArrayOutputStream;import java.io.InputStream;public class StreamTool {/** * 把一个inputstream里面的内容转化成一个byte[] */public static byte[] getBytes(InputStream is) throws Exception {ByteArrayOutputStream bos = new ByteArrayOutputStream();byte[] buffer = new byte[1024];int len = 0;while ((len = is.read(buffer)) != -1) {bos.write(buffer, 0, len);}is.close();bos.flush();byte[] result = bos.toByteArray();System.out.println(new String(result));return result;}}

NetUtil.java:

package service;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.net.URLConnection;import util.StreamTool;import android.graphics.Bitmap;import android.graphics.BitmapFactory;public class NetUtil {/** * 获取网络address地址对应的图片 *  * @param address * @return bitmap的类型 */public static Bitmap getImage(String address) throws Exception {// 通过代码 模拟器浏览器访问图片的流程URL url = new URL(address);HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setRequestMethod("GET");conn.setConnectTimeout(5000);// 获取服务器返回回来的流InputStream is = conn.getInputStream();byte[] imagebytes = StreamTool.getBytes(is);Bitmap bitmap = BitmapFactory.decodeByteArray(imagebytes, 0,imagebytes.length);return bitmap;}}

MainActivity

package com.example.entimageviewer;import java.io.IOException;import java.net.SocketTimeoutException;import service.NetUtil;import android.app.Activity;import android.graphics.Bitmap;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.ImageView;import android.widget.Toast;public class MainActivity extends Activity implements OnClickListener {private EditText mEtAddress;private Button mBtView;private ImageView mIvView;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);mEtAddress = (EditText) this.findViewById(R.id.editText1);mBtView = (Button) this.findViewById(R.id.chakan);mIvView = (ImageView) this.findViewById(R.id.imageView1);mBtView.setOnClickListener(this);}public void onClick(View v) {switch (v.getId()) {case R.id.chakan:// 按钮对应的点击事件String address = mEtAddress.getText().toString().trim();if ("".equals(address)) {Toast.makeText(this, "图片地址不能为空", Toast.LENGTH_SHORT).show();return;}try {Bitmap bitmap = NetUtil.getImage(address);mIvView.setImageBitmap(bitmap);} catch (Exception e) {if (e instanceof SocketTimeoutException) {Toast.makeText(this, "网络连接超时", Toast.LENGTH_SHORT).show();} else if (e instanceof IOException) {Toast.makeText(this, "读取数据错误 ", Toast.LENGTH_SHORT).show();} else {Toast.makeText(this, "未知错误 ", Toast.LENGTH_SHORT).show();}e.printStackTrace();}break;}}}

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="wrap_content"        android:layout_height="wrap_content"        android:text="@string/input_address" />    <EditText        android:id="@+id/editText1"        android:layout_width="match_parent"        android:lines="2"        android:text="http://172.16.40.157:8080/tomcat.png"        android:layout_height="wrap_content" />    <Button        android:id="@+id/chakan"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="@string/go" />    <ImageView        android:id="@+id/imageView1"        android:scaleType="center"        android:layout_width="match_parent"        android:layout_height="match_parent" /></LinearLayout>

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