实验_图片查看器

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运行效果图：

建立项目：D3PhotoLook;

首先加入网络权限：如图

MainActivity.java的全部代码：

package cn.example.d3_photolook;import java.io.InputStream;import java.net.URL;import javax.net.ssl.HttpsURLConnection;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.View;import android.widget.EditText;import android.widget.ImageView;public class MainActivity extends Activity{private EditText et_path;private ImageView iv;// 创建handler 对象private Handler handler = new Handler(){public void handleMessage(android.os.Message msg){Bitmap bitmap = (Bitmap) msg.obj;iv.setImageBitmap(bitmap);};};@Overrideprotected void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);et_path = (EditText) findViewById(R.id.et_path);iv = (ImageView) findViewById(R.id.iv);}public void click(View v){new Thread(){public void run(){try{// 访问路径String path = et_path.getText().toString().trim();// 创建url对象URL url = new URL(path);// 获取 HttpsURLConnectionHttpsURLConnection conn = (HttpsURLConnection) url.openConnection();// 设置请求的方式conn.setRequestMethod("GET");// 设置超时时间conn.setConnectTimeout(5000);// 获取服务器返回的状态码int code = conn.getResponseCode();if (code == 200){// 获取图片的数据InputStream in = conn.getInputStream();// 通过位图工厂获取bitmapBitmap bitmap = BitmapFactory.decodeStream(in);// 把bitmap显示到iv上Message msg = Message.obtain();msg.obj = bitmap;handler.sendMessage(msg);}} catch (Exception e){e.printStackTrace();}};}.start();}}

activity_main.xml的代码：

<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="cn.example.d3_photolook.MainActivity" >    <EditText        android:id="@+id/et_path"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="https://www.baidu.com/img/bd_logo1.png"        android:ems="10" >        <requestFocus />    </EditText>    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:onClick="click"        android:text="查看" />    <ImageView        android:id="@+id/iv"        android:layout_width="wrap_content"        android:layout_height="wrap_content" /></LinearLayout>

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