cordova-plugin-file 实例

由于项目需要从文件中读取数据，然后再显示到ionic中。所以用到了cordova-plugin-file这个插件，记录一下。

本实例是读取项目中的文件和设备中的文件，SDCARD里面的文件，暂时没有读取成功。

1. 首先，在项目中加入cordova-plugin-file这个插件, 不了解这个插件的话，就点这里

cordova plugin add cordova-plugin-file

别忘记加权限，在config.xml中添加
  <preference name="AndroidPersistentFileLocation" value="Internal" />
  <preference name="AndroidPersistentFileLocation" value="Compatibility" />
 
1. 读取项目目录中的文件 www/data
   var path = cordova.file.applicationDirectory + "www/data";
   window.resolveLocalFileSystemURL(path,
    function (fileSystem) {
      var reader = fileSystem.createReader();
      reader.readEntries(
        function (entries) {
          try {
                if(entries.length > 0){
                  $scope.data = [];
                  $scope.mainSettings = [];
                  for(var i = 0; i<entries.length; i++){
                    var entry = entries[i];
                    $scope.item = {'imgsrc':'images/group_land.png','title':entry.name.substring(0,entry.name.length-5),"fullPath":entry.fullPath,
                    "class":"color" + Math.round(Math.random()*3+1),"check":false,"colclass":""};
                    if( (i%3) == 0){
                        $scope.item.imgsrc = "images/group_land.png";
                    }else if((i%3) == 1){
                        $scope.item.imgsrc = "images/building_land.png";
                    }else if((i%3) == 2){
                        $scope.item.imgsrc = "images/house_land.png";
                        $scope.item.colclass = 'rightPadding';
                    }
                    $scope.mainSettings.push($scope.item);
                  }
                  $ionicLoading.hide();
                  $scope.$digest();
                }
          } catch (error) {
            $ionicLoading.hide();
            alert('error :' + error.message);
          }
          
          //for(var i = 0 ; i<entries.length;i++){
          //    var entry = entries[i];
           //   alert(JSON.stringify(entry));
          // }
          //console.log(entries);
        },
        function (err) {
          console.log(err);
          alert(err);
        }
      );
    }, function (err) {
      console.log(err);
      alert(err);
    }
  );

 

  2. 读手机存储中的文件（非SDCARD） file:///storage/emulated/0/, 在手机存储上新建一个文件夹 wfbdc_files、key.txt是它下面的文件
 
       $scope.readKey = function(){
          window.requestFileSystem(LocalFileSystem.PERSISTENT, 0,function(fileSystem){ // success get file system
              fileSystem.root.getDirectory('wfbdc_files', { create: false }, function (wfbdcEntry) {
                  wfbdcEntry.getFile('key.txt', { create: false }, function (keyEntry) {
                        keyEntry.file(function (file) {
                            var reader = new FileReader();
                            reader.onloadend = function(evt) {
                                  //alert(this.result);
                                  $scope.key = evt.target.result;
                                  $scope.$digest();
                              };
                              reader.readAsText(file);
                          }, onErrorReadFile);
                  },onLoadFileError);
              },onLoadFileError);
          })
    };