android 10 下载更新失败

function downWgt(url) {
console.log("checkupdate....");  
console.log(url);   
var dtask = plus.downloader.createDownload(url, {
method: "GET"
}, function(d, status) {   
console.log(status);   //console.log(status);

                if(status == 200) {         
                    console.log("下载成功 " + d.filename);         
                    plus.runtime.install(d.filename, {}, function() {        
                        console.log(d.filename + "install success....");        
                        if(d.filename.indexOf(".apk") >= 0) {        
                            plus.nativeUI.closeWaiting();        
                            plus.runtime.restart();        
                        }   
                    }, function(e) {        
                        console.log("install error....");        
                        if(d.filename.indexOf(".apk") >= 0) {        
                            mui.alert("安装失败:" + e.message);        
                        }   

                    });      
                } else {      
                    console.log("download error....");        

                }     
            });       
            dtask.addEventListener('statechanged', function(d, status) {     //console.log("statechanged: "+d.state);  
                  });    
            dtask.start();  
        }  

请教各位，Android 10，调用在线更新，在执行到plus.runtime.install时，程序反复重新打开，导致在线更新失败。