android查看网络图片的实现方法

本文实例为大家分享了android查看网络图片的具体代码，供大家参考，具体内容如下

需求描述： 输入一个 图片地址，下载到本地 展示。

效果展示

代码清单

mainactivity.java

package com.example.www.checkimage;

import android.graphics.bitmap;
import android.graphics.bitmapfactory;
import android.os.bundle;
import android.os.handler;
import android.os.message;
import android.support.v7.app.appcompatactivity;
import android.view.view;
import android.widget.edittext;
import android.widget.imageview;
import android.widget.toast;

import java.io.inputstream;
import java.net.httpurlconnection;
import java.net.url;

public class mainactivity extends appcompatactivity {

 private edittext mpt_url;
 private imageview miv_show;
 private handler mhandler = new handler(){
 @override
 public void handlemessage(message msg) {
 if(msg.what == 1){
 bitmap bitmap = (bitmap) msg.obj;
 miv_show.setimagebitmap(bitmap);
 toast.maketext(getapplicationcontext(), "图片展示成功", toast.length_long).show();
 }
 }
 };

 @override
 protected void oncreate(bundle savedinstancestate) {
 super.oncreate(savedinstancestate);
 setcontentview(r.layout.activity_main);

 mpt_url = (edittext) findviewbyid(r.id.pt_url);
 miv_show = (imageview) findviewbyid(r.id.imagecon);
 }

 public void checkimage(view v) {
 new thread(){
 @override
 public void run() {

 try {
  string path = mpt_url.gettext().tostring().trim();
  url url = new url(path);
  httpurlconnection conn = (httpurlconnection) url.openconnection();
  conn.setrequestmethod("get");
  conn.setconnecttimeout(5000);
  int responsecode = conn.getresponsecode();
  if(responsecode == 200) {
  inputstream is = conn.getinputstream();


  bitmap bitmap = bitmapfactory.decodestream(is);

  message msg = message.obtain(); // 创建 消息
  msg.obj = bitmap;
  msg.what = 1;


  mhandler.sendmessage(msg);
  }
 } catch (exception e) {
  e.printstacktrace();
 }

 }
 }.start();
 }
}

activiity_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">

 <edittext
 android:id="@+id/pt_url"
 android:layout_width="368dp"
 android:layout_height="wrap_content"
 android:layout_marginstart="8dp"
 android:layout_margintop="8dp"
 android:layout_marginend="8dp"
 android:ems="10"
 android:hint="请输入与图片地址"
 android:inputtype="textpersonname"
 app:layout_constraintend_toendof="parent"
 app:layout_constraintstart_tostartof="parent"
 app:layout_constrainttop_totopof="parent" />

 <button
 android:id="@+id/button"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_marginstart="8dp"
 android:layout_margintop="8dp"
 android:layout_marginend="8dp"
 android:text="button"
 app:layout_constraintend_toendof="parent"
 app:layout_constrainthorizontal_bias="0.0"
 app:layout_constraintstart_tostartof="parent"
 android:onclick="checkimage"
 app:layout_constrainttop_tobottomof="@+id/pt_url" />

 <imageview
 android:id="@+id/imagecon"
 android:layout_width="0dp"
 android:layout_height="0dp"
 android:layout_marginstart="8dp"
 android:layout_margintop="8dp"
 android:layout_marginend="8dp"
 android:layout_marginbottom="8dp"
 app:layout_constraintbottom_tobottomof="parent"
 app:layout_constraintend_toendof="parent"
 app:layout_constraintstart_tostartof="parent"
 app:layout_constrainttop_tobottomof="@+id/button"
 app:srccompat="@mipmap/ic_launcher" />
</android.support.constraint.constraintlayout>

androidmanifest.xml

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

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

 <application
 android: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">
 <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>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。