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创建工具类来完成我们的外部调用 一些修复加载图片的错乱代码

程序员文章站 2022-05-28 12:21:46
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public class NetUtil {

private static List<ContentBean.Data> data;

//获取网络的连接
public static List<ContentBean.Data> getRequest(String path){
    try {
        HttpURLConnection urlConnection = (HttpURLConnection) new URL(path).openConnection();
        int responseCode = urlConnection.getResponseCode();
        if(responseCode == 200){
            //调用转换字符串的方法
            String result = getstring(urlConnection.getInputStream());
            ContentBean bean = new Gson().fromJson(result, ContentBean.class);
            data = bean.getData();
            return  data;
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
    return null;
}

public static void getBitmap(final String imageUrl, final Callback callback){
    new AsyncTask<String, Void, Bitmap>() {
        @Override
        protected Bitmap doInBackground(String... strings) {
            return getBitmap(strings[0]);
        }
        @Override
        protected void onPostExecute(Bitmap bitmap) {

            callback.loadImageSuccess(imageUrl,bitmap);
        }
    }.execute(imageUrl);
}

public interface Callback{
    public void loadImageSuccess(String ImageUrl,Bitmap bitmap);
}
//吧线程吞掉
//因为是异步操作 不知道什么时候返回bitmap 所以不能返回结果
//加载图片大部分情况下是为了展示
public static void getBitmap(String imageUrl, final ImageView imageView){
    new AsyncTask<String, Void, Bitmap>() {
        @Override
        protected Bitmap doInBackground(String... strings) {
            return NetUtil.getBitmap(strings[0]);
        }

        @Override
        protected void onPostExecute(Bitmap bitmap) {
            imageView.setImageBitmap(bitmap);
        }
    }.execute(imageUrl);
}

//网络请求一张图片
public static Bitmap getBitmap(String path){

    try {
        HttpURLConnection urlConnection = (HttpURLConnection) new URL(path).openConnection();
        int responseCode = urlConnection.getResponseCode();
        if(responseCode == 200){
            //调用转换字符串的方法
            Bitmap bitmap = BitmapFactory.decodeStream(urlConnection.getInputStream());
            return bitmap;
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
    return null;
}

public static String getstring(InputStream is) throws IOException {
    StringBuilder builder = new StringBuilder();
    BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(is));
    for (String i = bufferedReader.readLine();i != null;i=bufferedReader.readLine()){
        builder.append(i);
    }
    return builder.toString();
}

}

相关标签: 图片加载