自己开发的Todos应用，想实现“
再按一次返回键退出程序
”的功能，采用网上的ToastPlugins插件，发现代码或文章基本都是老版本，运行问题比较多。折腾了好久才弄好。下面吧基于cordova3.3下的ToastPlugins相关代码共享。
ToastPlugin.java
|
package
com.hy.todos.plugins;
import
org.apache.cordova.CallbackContext;
import
org.apache.cordova.CordovaPlugin;
import
org.json.JSONArray;
import
org.json.JSONException;
import
android.util.Log;
import
android.widget.Toast;
public
class
ToastPlugin
extends
CordovaPlugin
{
@Override
public
boolean
execute(String action, JSONArray data,
final
CallbackContext callbackContext)
{
int
tmpDuration;
String tmpText =
"none"
;
Log.i(
"ToastPlugin"
,
"ToastPlugin json data::"
+data);
try
{
tmpText = data.getString(0);
}
catch
(JSONException e)
{
callbackContext.error(
"Parsing Text Exception"
);
return
false
;
}
try
{
tmpDuration = data.getInt(1);
}
catch
(JSONException e)
{
callbackContext.error(
"Parsing Duration Exception"
);
return
false
;
}
showMsg(tmpText,tmpDuration);
return
true
;
}
public
synchronized
void
showMsg(
final
String msg,
final
int
duration) {
Runnable runnable =
new
Runnable() {
public
void
run() {
Toast. makeText(
cordova
.getActivity(), msg, duration).show();
}
};
cordova
.getActivity().runOnUiThread(runnable);
}
}
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Toast-Plugin.js
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var
Toast=
function
() {
};
Toast.
prototype
.LENGTH_SHORT = 0;
Toast.
prototype
.LENGTH_LONG = 1;
Toast.
prototype
.show =
function
(msg, duration ,successCallback, failureCallback){
return
cordova.exec(
successCallback,
failureCallback,
'ToastPlugin'
,
null
,
[msg, duration]
);
};
//Short Toast
Toast.
prototype
.shortshow =
function
(msg,successCallback, failureCallback){
this
.show(msg,
this
.LENGTH_SHORT ,successCallback, failureCallback);
};
//Long Toast
Toast.
prototype
.longshow =
function
(msg,successCallback, failureCallback){
this
.show(msg,
this
.LENGTH_LONG ,successCallback, failureCallback);
};
cordova.addConstructor(
function
() {
if
(!window.plugins) {
window.plugins = {};
}
window.plugins.toast =
new
Toast();
});
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在deviceready事件中注册用户触发返回键的backbutton事件,在其中进行逻辑处理和调用插件代码：
|
var
quitflag = 0;
document.addEventListener(
"deviceready"
,onDeviceReady,
false
);
function
onDeviceReady() {
navigator.splashscreen.hide();
document.addEventListener(
"backbutton"
, eventBackButton,
false
);
//注册返回键
}
function
eventBackButton(){
if
(window.plugins.toast){
console.log(
"window.plugins.Toast......"
);
window.plugins.toast.shortshow(
"再按一次返回键退出程序"
);
}
quitflag++;
setTimeout(
function
() {
quitflag = 0;
}, 3000);
if
(quitflag >= 2) {
navigator.app.exitApp();
}
}
|
调试了好几次发现能正常按2此返回键退出代码，但确没有信心提示。最后发现是没有在config.xml中进行插件配置声明。晕！
|
<
feature
name
=
"ToastPlugin"
>
<
param
name
=
"android-package"
value
=
"com.hy.todos.plugins.ToastPlugin"
/>
</
feature
>
|
至此，ToastPlugin插件在Cordova3.3上完好运行！：）