获取网络图片

最新推荐文章于 2022-04-11 10:42:15 发布

武叔叔

最新推荐文章于 2022-04-11 10:42:15 发布

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CC 4.0 BY-SA版权

文章标签： wj

本文链接：https://blog.youkuaiyun.com/wj970204/article/details/74974369

本文介绍了一个简单的Android应用程序示例，该程序通过网络URL加载一张图片，并在按钮被点击后将其显示在一个ImageView中。示例代码展示了如何使用多线程进行图片下载及更新UI的方法。

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package com.example.dell.***;

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.Button;
import android.widget.ImageView;

import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;

public class MainActivity extends AppCompatActivity {
    private ImageView iv;
    private Button button;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        iv = (ImageView) findViewById(R.id.iv);
        button = (Button) findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        final Bitmap bitmap = getPicture( "http://imgstore04.cdn.sogou.com/app/a/100520024/877e990117d6a7ebc68f46c5e76fc47a");
                        try {
                            Thread.sleep(2000);
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                        iv.post(new Runnable() {
                            @Override
                            public void run() {
                                iv.setImageBitmap(bitmap);
                            }
                        });
                    }
                }).start();
            }
        });
    }
    public Bitmap getPicture(String path) {
        Bitmap bm = null;
        try {
            URL url = new URL(path);
            URLConnection urlConnection = url.openConnection();
            urlConnection.connect();
            InputStream is = urlConnection.getInputStream();
            bm = BitmapFactory.decodeStream(is);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return bm;
    }
}

<?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.example.dell.wujin.MainActivity">
<Button
    android:id="@+id/button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="点击"/>
<ImageView
    android:id="@+id/iv"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@+id/button"
    android:layout_alignParentRight="true"
    android:layout_alignParentEnd="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_alignParentBottom="true"/>
</RelativeLayout>

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