android studio 读取网络图片

川长思鸟来 2023-06-21 12:28 47阅读 0赞

activity\_main  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNzc3ODA0_size_16_color_FFFFFF_t_70]  
界面代码如下

<?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:layout_width="match_parent"
        android:layout_height="match_parent"
    
        tools:context=".MainActivity">
        <LinearLayout
            android:id="@+id/ll_text"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="5dp"
            android:layout_marginTop="10dp"
            android:orientation="horizontal">
            <EditText
                android:id="@+id/et_path"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_marginRight="3dp"
                android:layout_weight="1"
                android:background="#EBEBEB"
                android:hint="请输入图片路径"
                android:inputType="textUri"
                android:paddingLeft="3dp"
                android:textColor="#696969"
                android:textSize="20sp" />
            <Button
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="4"
                android:background="#EBEBEB"
                android:onClick="click"
                android:text="浏览"
                android:textColor="#696969"
                android:textSize="20sp" />
        </LinearLayout>
    
        <ImageView
            android:id="@+id/iv_pic"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_below="@+id/ll_text"
            android:scaleType="fitCenter" />
    </RelativeLayout>

MainActivity  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNzc3ODA0_size_16_color_FFFFFF_t_70 1]  
代码如下

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.text.TextUtils;
    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 {
        protected static final int CHANGE_UI = 1;
        protected static final int ERROR = 2;
        private EditText et_path;
        private ImageView ivPic;
        // 主线程创建消息处理器
        private Handler handler = new Handler() {
            public void handleMessage(android.os.Message msg) {
                if (msg.what == CHANGE_UI) {
                    Bitmap bitmap = (Bitmap) msg.obj;
                    ivPic.setImageBitmap(bitmap);
                } else if (msg.what == ERROR) {
                    Toast.makeText(MainActivity.this, "显示图片错误",
                            Toast.LENGTH_SHORT).show();
                }
            }
        };
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            et_path = (EditText) findViewById(R.id.et_path);
            ivPic = (ImageView) findViewById(R.id.iv_pic);
        }
        public void click(View view) {
            final String path = et_path.getText().toString().trim();
            if (TextUtils.isEmpty(path)) {
                Toast.makeText(this, "图片路径不能为空", Toast.LENGTH_SHORT).show();
            } else {
                //子线程请求网络,Android4.0以后访问网络不能放在主线程中
                new Thread() {
                    private HttpURLConnection conn;
                    private Bitmap bitmap;
                    public void run() {
                        // 连接服务器 get 请求 获取图片
                        try {
                            //创建URL对象
                            URL url = new URL(path);
                            // 根据url 发送 http的请求
                            conn = (HttpURLConnection) url.openConnection();
                            // 设置请求的方式
                            conn.setRequestMethod("GET");
                            //设置超时时间
                            conn.setConnectTimeout(5000);
                            // 得到服务器返回的响应码
                            int code = conn.getResponseCode();
                            //请求网络成功后返回码是200
                            if (code == 200) {
                                //获取输入流
                                InputStream is = conn.getInputStream();
                                //将流转换成Bitmap对象
                                bitmap = BitmapFactory.decodeStream(is);
                                //将更改主界面的消息发送给主线程
                                Message msg = new Message();
                                msg.what = CHANGE_UI;
                                msg.obj = bitmap;
                                handler.sendMessage(msg);
                            } else {
                                //返回码不等于200 请求服务器失败
                                Message msg = new Message();
                                msg.what = ERROR;
                                handler.sendMessage(msg);
                            }
                        } catch (Exception e) {
                            e.printStackTrace();
                            Message msg = new Message();
                            msg.what = ERROR;
                            handler.sendMessage(msg);
                        }
                        //关闭连接
                        conn.disconnect();
                    }
                }.start();
            }
        }
    }

最后记得给 AndroidManifest中 加上 访问网络的权限  
![在这里插入图片描述][20191212201456835.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNzc3ODA0_size_16_color_FFFFFF_t_70 2]

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

最后打开虚拟机  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNzc3ODA0_size_16_color_FFFFFF_t_70 3]

输入图片地址  
https://timgsa.baidu.com/timg?image&quality=80&size=b9999\_10000&sec=1576162426696&di=d84e2f38070db06a909401060b047222&imgtype=0&src=http%3A%2F%2Fpic1.zhimg.com%2F50%2Fv2-fe41e8f50ce5a9d096f29585551d02c8\_hd.jpg

点击浏览即可  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNzc3ODA0_size_16_color_FFFFFF_t_70 4]

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNzc3ODA0_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20191212201324701.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNzc3ODA0,size_16,color_FFFFFF,t_70
[20191212201456835.png]: https://img-blog.csdnimg.cn/20191212201456835.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNzc3ODA0_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20191212201530500.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNzc3ODA0,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNzc3ODA0_size_16_color_FFFFFF_t_70 3]: https://img-blog.csdnimg.cn/20191212201713269.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNzc3ODA0,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNzc3ODA0_size_16_color_FFFFFF_t_70 4]: https://img-blog.csdnimg.cn/20191212201936361.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyNzc3ODA0,size_16,color_FFFFFF,t_70