mui开发App中，使用nativejs设置input焦点并触发软键盘

var showSoftInput= function(id) {
var nativeWebview, imm, InputMethodManager;
//初始化NativeObject
if(mui.os.android) {
var main = plus.android.runtimeMainActivity();
var Context = plus.android.importClass("android.content.Context");
InputMethodManager = plus.android.importClass("android.view.inputmethod.InputMethodManager");
imm = main.getSystemService(Context.INPUT_METHOD_SERVICE);
} else {
nativeWebview = plus.webview.currentWebview().nativeInstanceObject();
}
//获取焦点并调用软键盘
var nativeWebview = plus.webview.currentWebview().nativeInstanceObject();
if(mui.os.android) {
//强制当前webview获得焦点
plus.android.importClass(nativeWebview);
nativeWebview.requestFocus();
imm.toggleSoftInput(0, InputMethodManager.SHOW_FORCED);
} else {
nativeWebview.plusCallMethod({
"setKeyboardDisplayRequiresUserAction": false
});
}
setTimeout(function() {
//此处可写具体逻辑设置获取焦点的input
var inputObj = document.getElementById(id);
inputObj.focus();
}, 200);
};

document.addEventListener("plusready", function() {
showSoftInput("keyword");
});