https://gitee.com/xiyangyang8110/xUtils3
1依赖
jcenter()库不好用可换成3.8.12版本的maven库

implementation 'org.xutils:xutils:3.9.0'

maven库

implementation 'org.xutils:xutils:3.8.12'

https://mvnrepository.com/artifact/org.xutils/xutils
2

public class MyApp extends Application {
    // 在application的onCreate中初始化
    @Override
    public void onCreate() {
        super.onCreate();
        x.Ext.init(this);
        x.Ext.setDebug(BuildConfig.DEBUG); // 是否输出debug日志, 开启debug会影响性能.
    }


}

3

public class Constant {

    public static final String BaseUrl = "https://www.baidu.com";
    public static final String login = BaseUrl + "/platformUser/appUser/login";

}

4 post访问

RequestParams params = new RequestParams(Constant.login);

//                params.addHeader("language","zh_CN");
//                params.addHeader("platform","mobile");
//                params.addHeader("content-type","application/json;charset=utf-8");

                params.addBodyParameter("appId", 8);
                params.addBodyParameter("username", edtPhoneNum.getText().toString().trim());
                params.addBodyParameter("password", edtPw.getText().toString().trim());
                params.setAsJsonContent(true);
                x.http().post(params, new Callback.CommonCallback<String>() {
                    @Override
                    public void onSuccess(String result) {
                        Log.e("wy", "result: " + result);
                        startActivity(new Intent(LoginActivity.this, MainActivity.class));
                    }

                    @Override
                    public void onError(Throwable ex, boolean isOnCallback) {
                        Log.e("wy", "result: " + ex.getMessage());
                    }

                    @Override
                    public void onCancelled(CancelledException cex) {
                        Toast.makeText(x.app(), "cancelled", Toast.LENGTH_LONG).show();
                    }

                    @Override
                    public void onFinished() {

                    }
                });

5 get访问

RequestParams requestParams=new RequestParams("http://apk.hiapk.com/appdown/com.jrd.loan?planid=2596578&seid=c7158e65-11a0-0001-d9d5-1c101bd0192d");
        requestParams.setAutoResume(true);
        requestParams.setCancelFast(true);
        requestParams.setSaveFilePath(Environment.getExternalStorageDirectory().getAbsolutePath()+"/mmmmmmm.zip");
        mCancelable = x.http().get(requestParams, new Callback.ProgressCallback<File>() {
            @Override
            public void onSuccess(File result) {
                System.out.println("下载成功");
            }
        
            @Override
            public void onError(Throwable ex, boolean isOnCallback) {
                System.out.println("下载失败");
            }
        
            @Override
            public void onCancelled(CancelledException cex) {
                System.out.println("下载取消");
            }
        
            @Override
            public void onFinished() {
                System.out.println("下载任务完成");
            }
        
            @Override
            public void onWaiting() {
                System.out.println("等着。。");
            }
        
            @Override
            public void onStarted() {
                System.out.println("开始了");
            }
        
            @Override
            public void onLoading(long total, long current, boolean isDownloading) {
                System.out.println("下载中  总大小：  " + total + "   已下载量： " + current);
                mTv.setText(current + "/" + total);
                mProb.setProgress((int) (current * 1.0f / total * 100));
            }
        });