一.web网络图片查看器Android

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".MainActivity"><ImageViewandroid:id="@+id/iv"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginStart="8dp"android:layout_marginLeft="8dp"android:layout_marginTop="8dp"android:layout_marginEnd="8dp"android:layout_marginRight="8dp"android:layout_marginBottom="8dp"android:scaleType="center"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintStart_toStartOf="parent"app:layout_constraintTop_toTopOf="parent"app:srcCompat="@mipmap/ic_launcher" /><Buttonandroid:id="@+id/button"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginStart="16dp"android:layout_marginLeft="16dp"android:layout_marginBottom="56dp"android:onClick="pre"android:text="上一张"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintStart_toStartOf="parent" /><Buttonandroid:id="@+id/button2"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginEnd="16dp"android:layout_marginRight="16dp"android:layout_marginBottom="56dp"android:onClick="next"android:text="下一张"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintEnd_toEndOf="parent" />
</android.support.constraint.ConstraintLayout>

MainActivity

package com.glsite.netimageviewer;import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import android.widget.Toast;import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;public class MainActivity extends AppCompatActivity {private static final int LOAD_ERROR = 2;private static final int LOAD_IMAGE = 1;private ImageView mIv;private Handler mHandler = new Handler(new Handler.Callback() {@Overridepublic boolean handleMessage(Message msg) {switch (msg.what) {case LOAD_IMAGE:Bitmap bitmap = (Bitmap) msg.obj;mIv.setImageBitmap(bitmap);Toast.makeText(MainActivity.this, "加载图片成功", Toast.LENGTH_SHORT).show();break;case LOAD_ERROR:System.out.println("LOAD_ERROR");Toast.makeText(MainActivity.this, "加载图片失败", Toast.LENGTH_SHORT).show();break;default:break;}return false;}});private ArrayList<String> mPaths;private int currentPosition = 0;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mIv = findViewById(R.id.iv);// 1.连接服务器，获取所有的图片链接信息loadAllImagePath();}/*** 获取全部图片资源路径*/private void loadAllImagePath() {new Thread() {@Overridepublic void run() {// 浏览器发送一个get请求就可以把服务器的数据获取出来// 用代码模拟一个http的get请求try {// 1.得到服务器资源的路径URL url = new URL("http://192.168.1.130:8080/Day10/img/gaga.html");// 待会儿要解决一个问题，需要注意https/http以及虚拟机ip的问题 ;创建network_security_config.xml及在AndroidManifest.xml中添加数据才能进行http请求// 2.通过这个路径打开浏览器的链接HttpURLConnection conn = (HttpURLConnection) url.openConnection();// 3.设置请求方式为GETconn.setRequestMethod("GET");// 注意请求方式只能大写，不能小写// 为了有一个更好的用户ui提醒，获取服务器的返回状态码int code = conn.getResponseCode();if (code == 200) {// 返回成功InputStream is = conn.getInputStream();File file = new File(getCacheDir(), "info.txt");FileOutputStream fos = new FileOutputStream(file);int len = 0;byte[] buffer = new byte[1024];while ((len = is.read(buffer)) != -1) {fos.write(buffer, 0, len);}is.close();fos.close();System.out.println("code == 200");// 获取了所有的链接之后，就要去加载图片beginLoadImage();} else if (code == 404) {// 资源未找到Message msg = Message.obtain();msg.what = LOAD_ERROR;msg.obj = "获取html失败,返回码：" + code;mHandler.sendMessage(msg);} else {// 其他响应码Message msg = Message.obtain();msg.what = LOAD_ERROR;msg.obj = "服务器或网络异常,返回码：" + code;mHandler.sendMessage(msg);}} catch (Exception e) {e.printStackTrace();}}}.start();}/*** 开始加载图片，在从服务器获取完毕资源路径之后执行*/private void beginLoadImage() {try {mPaths = new ArrayList<>();File file = new File(getCacheDir(), "info.txt");FileInputStream fis = new FileInputStream(file);BufferedReader br = new BufferedReader(new InputStreamReader(fis));String line;while ((line = br.readLine()) != null) {mPaths.add(line);}fis.close();loadImageByPath(mPaths.get(currentPosition));} catch (Exception e) {e.printStackTrace();}}/*** 通过路径加载图片** @param path*/private void loadImageByPath(final String path) {new Thread() {@Overridepublic void run() {File file = new File(getCacheDir(), path.replace("/", "") + ".jpg");if (file.exists() && file.length() > 0) {// 有缓存System.out.println("通过缓存把图片获取出来...");Message msg = Message.obtain();msg.what = LOAD_IMAGE;msg.obj = BitmapFactory.decodeFile(file.getAbsolutePath());mHandler.sendMessage(msg);} else {// 没有缓存的话，就需要去下载System.out.println("通过访问网络把图片资源获取出来");try {URL url = new URL(path);HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setRequestMethod("GET");int code = conn.getResponseCode();if (code == 200) {InputStream is = conn.getInputStream();// 内存中的图片Bitmap bitmap = BitmapFactory.decodeStream(is);FileOutputStream fos = new FileOutputStream(file);bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);fos.close();is.close();Message msg = Message.obtain();msg.what = LOAD_IMAGE;msg.obj = BitmapFactory.decodeFile(file.getAbsolutePath());mHandler.sendMessage(msg);} else {Message msg = Message.obtain();msg.what = LOAD_ERROR;msg.obj = "获取图片失败，返回码：" + code;mHandler.sendMessage(msg);}} catch (Exception e) {e.printStackTrace();Message msg = Message.obtain();msg.what = LOAD_ERROR;msg.obj = "获取图片失败";mHandler.sendMessage(msg);}}}}.start();}/*** 上一张图片** @param view*/public void pre(View view) {currentPosition--;if (currentPosition < 0) {currentPosition = mPaths.size() - 1;}loadImageByPath(mPaths.get(currentPosition));}/*** 下一张图片** @param view*/public void next(View view) {currentPosition++;if (currentPosition == mPaths.size()) {currentPosition = 0;}loadImageByPath(mPaths.get(currentPosition));}
}

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

注意:

app\src\main\res\xml路径下创建network_security_config.xml

<?xml version="1.0" encoding="utf-8"?>
<network-security-config><base-config cleartextTrafficPermitted="true" />
</network-security-config>

AndroidManifest.xml 添加数据才能进行http请求

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.glsite.netimageviewer"><uses-permission android:name="android.permission.INTERNET"/><applicationandroid:allowBackup="true"android:icon="@mipmap/ic_launcher"android:label="@string/app_name"android:roundIcon="@mipmap/ic_launcher_round"android:supportsRtl="true"android:theme="@style/AppTheme"android:networkSecurityConfig="@xml/network_security_config"><activity android:name=".MainActivity"><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity></application></manifest>

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