android网络图片查看器简单实现代码

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

效果图：

1.输入一个图片url

2.转换成bitmap位图

3.展示到imageview上

xml：

<?xml version="1.0" encoding="utf-8"?>
<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:id="@+id/activity_main"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:paddingbottom="@dimen/activity_vertical_margin"
  android:paddingleft="@dimen/activity_horizontal_margin"
  android:paddingright="@dimen/activity_horizontal_margin"
  android:paddingtop="@dimen/activity_vertical_margin"
  tools:context="com.itheima74.internetpicturelook.mainactivity">

  <edittext
    android:id="@+id/et_url"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignparentleft="true"
    android:layout_alignparentstart="true"
    android:layout_alignparenttop="true"
    android:hint="请输入图片网址"
    android:inputtype="texturi"
    android:text="http://b.hiphotos.baidu.com/image/pic/item/d009b3de9c82d15825ffd75c840a19d8bd3e42da.jpg" />

  <button
    android:id="@+id/bt_look"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_below="@+id/et_url"
    android:text="查看图片" />

  <scrollview
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@+id/bt_look"
    android:layout_centerhorizontal="true">

    <imageview
      android:id="@+id/iv"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content" />
  </scrollview>

</relativelayout>

java代码：

package com.itheima74.internetpicturelook;

import android.graphics.bitmap;
import android.graphics.bitmapfactory;
import android.os.bundle;
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.ioexception;
import java.io.inputstream;
import java.net.httpurlconnection;
import java.net.url;

public class mainactivity extends appcompatactivity {

  private edittext et_url;
  private imageview iv;

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

    et_url = (edittext) findviewbyid(r.id.et_url);
    iv = (imageview) findviewbyid(r.id.iv);
    findviewbyid(r.id.bt_look).setonclicklistener(new view.onclicklistener() {
      @override
      public void onclick(view v) {
        string path = et_url.gettext().tostring().trim();
        if (path.isempty()) {
          toast.maketext(mainactivity.this, "请输入图片网址", toast.length_short).show();
        } else {
          //开启子线程去网络下载图片
          downloadpicture(path);
        }
      }

      private void downloadpicture(final string path) {
        // 子线程请求网络
        new thread() {
          @override
          public void run() {
            try {
              url url = new url(path);
              httpurlconnection connection = (httpurlconnection) url.openconnection();
              connection.setrequestmethod("get");
              connection.setconnecttimeout(5000);
              int responsecode = connection.getresponsecode();
              if (responsecode == 200) {
                inputstream inputstream = connection.getinputstream();
                final bitmap bitmap = bitmapfactory.decodestream(inputstream);
                // 主线程更新ui
                runonuithread(new runnable() {
                  @override
                  public void run() {
                    iv.setimagebitmap(bitmap);
                  }
                });
              }
            } catch (ioexception e) {
              e.printstacktrace();
            }
          }
        }.start();
      }
    });
  }

}

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。