health小程序

最新推荐文章于 2023-05-05 11:28:31 发布

原创最新推荐文章于 2023-05-05 11:28:31 发布 · 306 阅读

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CC 4.0 BY-SA版权

本文介绍了一个简单的Android应用程序，用于从网络加载并显示图片。通过使用HttpURLConnection发起GET请求，该应用能够处理网络请求并解析返回的图片数据。此外，还介绍了如何在Android应用中加载网页内容。

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源码：

package cn.edu.bzu.a18lab12;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Paint;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

public class MainActivity extends AppCompatActivity {
    TextView etUrl;
    ImageView ivNetImage;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        etUrl=(TextView)findViewById(R.id.etUrl);
        etUrl.getPaint().setFlags(Paint.DITHER_FLAG);
    }
    public void showImage(View view){
        String path=etUrl.getText().toString();
        if(TextUtils.isEmpty(path)){//如果path为空
            Toast.makeText(this,"图片路径不能为空",Toast.LENGTH_SHORT).show();
        }else {
            //连接服务器，发送请求
            try {
                URL url=new URL(path);
                //发出http请求
                HttpURLConnection httpURLConnection =(HttpURLConnection) url.openConnection();
                httpURLConnection.setRequestMethod("GET");
                //设置链接超时时间
                httpURLConnection.setConnectTimeout(5000);
                int responsecode=httpURLConnection.getResponseCode();
                if(responsecode==200){
                    InputStream is=httpURLConnection.getInputStream();
                    Bitmap bitmap= BitmapFactory.decodeStream(is);
                    ivNetImage.setImageBitmap(bitmap);
                }else {
                    Toast.makeText(this,"显示图片失败",Toast.LENGTH_SHORT).show();
                }
            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }
}
package cn.edu.bzu.health;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.webkit.WebView;
import android.webkit.WebViewClient;

/**
 * Created by Administrator on 2017/5/26.
 */

public class HealthWebView {
    private Context context;

    public HealthWebView(Context context) {
        this.context = context;
    }

    public View getView(String url) {
        View view = LayoutInflater.from(context).inflate(R
                .layout.pagerofhealth,null);
        WebView webView = (WebView) view.findViewById(R.id.wvHealth);
        webView.loadUrl(url);
        // 设置支持JavaScript脚本
        webView.getSettings().setJavaScriptEnabled(true);
        /**
         * 禁止系统浏览器打开页面
         */
        webView.setWebViewClient(new WebViewClient() {
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                view.loadUrl(url);
                return true;
            }
        });
        return view;
    }
}
package cn.edu.bzu.health.adapter;

import android.support.v4.view.PagerAdapter;
import android.view.View;
import android.view.ViewGroup;

import java.util.List;

/**
 * Created by Administrator on 2017/5/26.
 */

public class HealthViewPagerAdapter extends PagerAdapter{
    private List viewList;
    public HealthViewPagerAdapter(List viewList) {
        this.viewList = viewList;
    }
    @Override
    public int getCount() {
        return viewList.size();
    }
    @Override
    public boolean isViewFromObject(View view, Object object) {
        return view==object;
    }
    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        container.addView(viewList.get(position));
        return viewList.get(position);
    }
    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        container.removeView(viewList.get(position));
    }

}

除此之外还需设置权限

在配置文件中application后加上<uses-permission android:name="android.permission.INTERNET"/> 这句话