下载安装apk(最终)

public void xiazaiAPK() {
        String wangzhi = "http://down11.zol.com.cn/suyan/lulutong3.6.5g.apk";
        String path = Environment.getExternalStorageDirectory().getPath() + "/teme1/myapk.apk";
        File file = new File(path);
        File parentFile = file.getParentFile();
        if (!parentFile.exists()) {
            parentFile.mkdir();
        }
        RequestParams params = new RequestParams(wangzhi);
        params.setAutoRename(false);
        params.setAutoResume(true);
        params.setSaveFilePath(path);
        x.http().get(params, new Callback.ProgressCallback<File>() {
            @Override
            public void onSuccess(File result) {
                Toast.makeText(MainActivity.this, "下载成功", Toast.LENGTH_SHORT).show();
                installDownloadApk(result);
            }

            @Override
            public void onError(Throwable ex, boolean isOnCallback) {
                Toast.makeText(MainActivity.this, "下载失败", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onCancelled(CancelledException cex) {

            }

            @Override
            public void onFinished() {
                cancleProgressDialog();

            }

            @Override
            public void onWaiting() {

            }

            @Override
            public void onStarted() {
                showProgressDialog();

            }

            @Override
            public void onLoading(long total, long current, boolean isDownloading) {
                int progress = (int) (current / total * 100);
                if (progress >= 0 && progress <= 100) {
                    updataProgressDialog(progress);
                }
            }
        });

    }
    private void installDownloadApk(File result){
        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        intent.setDataAndType(Uri.fromFile(result), "application/vnd.android.package-archive");
        startActivity(intent);
    }
    private void cancleProgressDialog(){
        if (progressDialog == null) {
            return;
        }
        if (progressDialog.isShowing()) {
            progressDialog.dismiss();
        }
    }
    private void showProgressDialog(){
        progressDialog = new ProgressDialog(this);

        //设置progressDialog显示样式
        progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
        progressDialog.setMessage("我正在下载东西");
        progressDialog.setTitle("请等待");
        progressDialog.setProgress(0);
        progressDialog.show();
    }
    private void updataProgressDialog(int progress){
        if (progressDialog == null) {
            return;
        }
        progressDialog.setProgress(progress);
    }