如何檢查設備能力

如何檢查設備的能力android cordova？任何人都可以提供代碼？上下文變量錯誤..顯示上下文變量在這個位置爲空，而試圖運行設備中的代碼顯示力關閉！我試圖檢查相機capability..please幫助...在此先感謝如何檢查設備能力

package com.troubling.android; 
import org.apache.cordova.api.CallbackContext; 
import org.apache.cordova.api.CordovaPlugin; 
import org.json.JSONArray; 
import org.json.JSONException; 

import android.app.Activity; 
import android.content.pm.PackageManager; 
import android.content.Context; 
import android.util.Log; 

public class Echo extends CordovaPlugin { 

    @Override 
    public boolean execute(String action, JSONArray args, CallbackContext callbackContext) throws 
    JSONException 
    { 
     Context context = null; 
     PackageManager pm = this.cordova.getActivity().getPackageManager(); 


     if (pm.hasSystemFeature(PackageManager.FEATURE_CAMERA)) { 


      Log.i("camera", "This device has camera!"); 
     } 
     else{ 

      Log.i("camera", "This device has no camera!"); 
     } 

return false; 

    } 

    private void echo(String message, CallbackContext callbackContext) { 
     if (message != null && message.length() > 0) { 
      callbackContext.success(message); 
     } else { 
      callbackContext.error("Expected one non-empty string argument."); 
     } 
    } 

}

來源

2013-07-12 satham_rahman

嘗試

PackageManager pm = this.cordova.getActivity().getApplicationContext().getPackageManager();

來源

2013-07-12 09:18:48

如何檢查設備能力

回答

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