Cordova 3 Android插件 - 如何在主要活動中調用函數？

Question

編輯：用戶QuickFix的答案爲我工作。代碼在這個問題的底部。

我想寫一個科爾多瓦3 Android插件，使正常和自定義吐司。不過，我只是一名前端開發人員，對科爾多瓦和Android來說都是新手。我仍然在學習，並希望你能給予任何幫助。

到目前爲止，我已經成功地單獨和成功地做到這2項任務：

1. 編寫一個函數中的主要活動，使正常的和自定義吐司（自定義吐司簡直是在/ RES /佈局的RelativeLayout顯示一個圖標和一些文字）。
2. 按照Devgirl的教程編寫Cordova插件：How to Write a PhoneGap 3.0 Plugin for Android。

我現在的問題是 - 如何讓插件在主要活動中調用showCustomToast()函數？正如你可以在下面的代碼塊＃2中看到的，我遇到了如何甚至得到的主要活動，所以我可以打電話showCustomToast()的問題。下面是我當前如何這樣做的摘錄：

// Problem? 
HelloCordova main = (HelloCordova) cordova.getActivity(); 
main.showCustomToast(toastTitle, toastText, duration); 

我要投cordova.getActivity()到HelloCordova，否則也不會承認它有的showCustomToast()功能。但肯定這是不是正確的方法，雖然它「工作」，即我能夠得到自定義Toast顯示在應用程序中。我只是忍不住覺得我已經完全錯誤地瞭解了這一點。這不完全是一個可重用的插件！

如果有人能讓我走上如何實現這一目標的正確道路，我將不勝感激。例如，我應該完全放棄插件，而只是放棄do this？

這是我的第一個Stackoverflow問題，請讓我知道如果我應該改變或澄清任何東西。感謝您的閱讀！

這裏是我現有的代碼：

代碼塊＃1

這HelloCordova類開始一個新的科爾多瓦項目時自動生成。我添加了showCustomToast()函數。

package io.cordova.hellocordova; 

import android.os.Bundle; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.TextView; 
import android.widget.Toast; 

import org.apache.cordova.*; 

public class HelloCordova extends CordovaActivity 
{ 
    @Override 
    public void onCreate(Bundle savedInstanceState) 
    { 
     super.onCreate(savedInstanceState); 
     super.init(); 
     // Set by <content src="index.html" /> in config.xml 
     super.loadUrl(Config.getStartUrl()); 
     //super.loadUrl("file:///android_asset/www/index.html") 

    } 
    public void showCustomToast(String toastTitleText, String toastDescText, int toastDuration) { 
     Toast toast = new Toast(this); 
     toast.setDuration(toastDuration); 

     LayoutInflater inflater = getLayoutInflater(); 
     View appearance = inflater.inflate(R.layout.toast_layout, (ViewGroup) findViewById(R.id.toastRoot)); 
     toast.setView(appearance); 

     TextView toastTitle = (TextView) appearance.findViewById(R.id.toastTitle); 
     toastTitle.setText(toastTitleText); 

     TextView toastDesc = (TextView) appearance.findViewById(R.id.toastDescription); 
     toastDesc.setText(toastDescText); 

     toast.show(); 
    } 
} 

代碼塊＃2

科爾多瓦插件的爪哇一部分。

package com.example.plugins.toast; 

//Problem? 
import io.cordova.hellocordova.HelloCordova; 

import org.apache.cordova.CallbackContext; 
import org.apache.cordova.CordovaPlugin; 
import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

import android.content.Context; 
import android.util.Log; 
import android.widget.Toast; 

public class ToastPlugin extends CordovaPlugin { 

    final String LOG_TAG = "ToastLog"; 
    public static final String ACTION_NORMAL_TOAST = "normalToast"; 
    public static final String ACTION_CUSTOM_TOAST = "customToast"; 

    @Override 
    public boolean execute(String action, JSONArray args, 
      CallbackContext callbackContext) throws JSONException { 

     final JSONObject arg_object = args.getJSONObject(0); 
     final String toastTitle = arg_object.getString("toastTitle"); 
     final String toastText = arg_object.getString("toastText"); 
     final String toastDuration = arg_object.getString("toastDuration"); 

     final CallbackContext ctx = callbackContext; 

     try { 
      if (ACTION_NORMAL_TOAST.equals(action)) { 
       Log.d(LOG_TAG, "Normal toast: " + toastText); 

       Runnable runnable = new Runnable() { 
        public void run() { 
         Context context = cordova.getActivity() 
           .getApplicationContext(); 
         int duration = Toast.LENGTH_SHORT; 
         if (toastDuration.equals("LONG")) { 
          duration = Toast.LENGTH_LONG; 
         } 
         Toast.makeText(context, toastText, duration).show(); 
        } 
       }; 
       this.cordova.getActivity().runOnUiThread(runnable); 

       callbackContext.success(); 
       return true; 
      } else if (ACTION_CUSTOM_TOAST.equals(action)) { 
       Log.d(LOG_TAG, "Custom toast: " + toastTitle + ": " + toastText); 

       Runnable runnable = new Runnable() { 
        public void run() { 
         int duration = Toast.LENGTH_SHORT; 
         if (toastDuration.equals("LONG")) { 
          duration = Toast.LENGTH_LONG; 
         } 
         //Problem? 
         HelloCordova main = (HelloCordova) cordova 
           .getActivity(); 
         main.showCustomToast(toastTitle, toastText, duration); 
         ctx.success(); 

        } 
       }; 
       this.cordova.getActivity().runOnUiThread(runnable); 

       callbackContext.success(); 
       return true; 
      } 
      callbackContext.error("Invalid action"); 
      return false; 
     } catch (Exception e) { 
      System.err.println("Exception: " + e.getMessage()); 
      callbackContext.error(e.getMessage()); 
      return false; 
     } 
    } 
} 

編輯：這是爲我工作的解決方案。正如QuickFix在他們的答案中提到的，自定義的Toast代碼現在在插件中。

package com.example.plugins.toast; 

import org.apache.cordova.CallbackContext; 
import org.apache.cordova.CordovaPlugin; 
import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

import android.content.Context; 
import android.content.res.Resources; 
import android.util.Log; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.widget.TextView; 
import android.widget.Toast; 

public class ToastPlugin extends CordovaPlugin { 

    final String LOG_TAG = "ToastLog"; 
    public static final String ACTION_NORMAL_TOAST = "normalToast"; 
    public static final String ACTION_CUSTOM_TOAST = "customToast"; 

    @Override 
    public boolean execute(String action, JSONArray args, CallbackContext callbackContext) throws JSONException { 

     final JSONObject arg_object = args.getJSONObject(0); 
     final String toastTitle = arg_object.getString("toastTitle"); 
     final String toastText = arg_object.getString("toastText"); 
     final String toastDuration = arg_object.getString("toastDuration"); 

     try { 
      if (ACTION_NORMAL_TOAST.equals(action)) { 

       Log.i(LOG_TAG, "[Normal toast] toastText: " + toastText); 

       Runnable runnable = new Runnable() { 
        public void run() { 
         Context context = cordova.getActivity().getApplicationContext(); 
         int duration = Toast.LENGTH_SHORT; 
         if (toastDuration.equals("LONG")) { 
          duration = Toast.LENGTH_LONG; 
         } 
         Toast.makeText(context, toastText, duration).show(); 
        } 
       }; 
       this.cordova.getActivity().runOnUiThread(runnable); 
       callbackContext.success(); 
       return true; 

      } else if (ACTION_CUSTOM_TOAST.equals(action)) { 

       Log.i(LOG_TAG, "[Custom toast] toastTitle: " + toastTitle + "\n toastText: " + toastText); 

       Runnable runnable = new Runnable() { 
        public void run() { 
         int duration = Toast.LENGTH_SHORT; 
         if (toastDuration.equals("LONG")) { 
          duration = Toast.LENGTH_LONG; 
         } 

         Context context = cordova.getActivity().getApplicationContext(); 

         Toast toast = new Toast(context); 
         toast.setDuration(duration);  

         LayoutInflater inflater = LayoutInflater.from(context); 

         Resources resources = context.getResources();      
         String packageName = context.getPackageName(); 

         View appearance = inflater.inflate(resources.getIdentifier("toast_layout","layout",packageName),null); 
         toast.setView(appearance); 

         TextView toastTitleView = (TextView) appearance.findViewById(resources.getIdentifier("toastTitle","id",packageName)); 
         toastTitleView.setText(toastTitle); 

         TextView toastDesc = (TextView) appearance.findViewById(resources.getIdentifier("toastDescription","id",packageName)); 
         toastDesc.setText(toastText); 

         toast.show(); 
        } 
       }; 
       this.cordova.getActivity().runOnUiThread(runnable); 
       callbackContext.success(); 
       return true; 

      } 
      callbackContext.error("Invalid action"); 
      return false; 
     } catch (Exception e) { 
      System.err.println("Exception: " + e.getMessage()); 
      callbackContext.error(e.getMessage()); 
      return false; 
     } 
    } 
} 

Answer 1

也許你可以把showCustomToast裏面的插件，而不是在應用程序內？

在這種情況下，你將不得不在功能上R.layout.layoutname和R.id.viewname與

getApplication().getResources().getIdentifier("layoutname","layout",getApplication().getPackageName()); 

和

getApplication().getResources().getIdentifier("viewname","id",getApplication().getPackageName());