man*_*ank 3 java plugins android cordova
编辑：用户 QuickFix 的回答对我有用。代码就在这个问题的底部。
我正在尝试编写一个 Cordova 3 Android 插件来制作普通和自定义 Toast。但是，我只是一名前端开发人员，对 Cordova 和 Android 非常陌生。我仍在学习，并希望您能提供任何帮助。
到目前为止，我已经成功地单独完成了这两项任务：
我现在的问题是 - 如何让插件showCustomToast()在主活动中调用函数？正如您在下面的代码块 #2 中看到的那样，我遇到了如何获取主要活动以便我可以调用showCustomToast(). 这是我目前如何执行此操作的摘录：
// Problem?
HelloCordova main = (HelloCordova) cordova.getActivity();
main.showCustomToast(toastTitle, toastText, duration);
我必须强制转换cordova.getActivity()为HelloCordova，否则它不会识别它具有该showCustomToast()功能。但这肯定不是正确的方法，尽管它确实“有效”，即我能够在应用程序中显示自定义 Toast。我不禁觉得我完全以错误的方式解决了这个问题。目前它不完全是一个可重用的插件！
如果有人能让我走上实现这一目标的正确道路，我将不胜感激。例如，我是否应该完全放弃插件而只做这个？
这是我的第一个 Stackoverflow 问题，所以如果我应该更改或澄清任何内容，请告诉我。谢谢阅读！！
这是我现有的代码：
代码块 #1
这个HelloCordova类是在启动一个新的 Cordova 项目时自动生成的。我加了这个showCustomToast()功能。
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();
}
}
代码块 #2
Cordova 插件的 Java 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;
}
}
}
编辑：这是对我有用的解决方案。正如 QuickFix 在下面的回答中提到的，自定义 Toast 代码现在在插件中。
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;
}
}
}
也许您可以将 showCustomToast 放在插件中而不是应用程序中？
在这种情况下，你将不得不在功能上取代R.layout.layoutname并R.id.viewname与
getApplication().getResources().getIdentifier("layoutname","layout",getApplication().getPackageName());
和
getApplication().getResources().getIdentifier("viewname","id",getApplication().getPackageName());