来自JavascriptInterface的android startActivity [英] android startActivity from JavascriptInterface

问题描述

一个简单的一般性问题.

Simple general question.

Webview已连接到我的JavascriptInterface类，并且肯定可以正常运行.但是，由于JavascriptInterface不会扩展Activity，因此我似乎无法使用startActivity(intent);来进行新的活动.

Webview is hooked up to my JavascriptInterface class and it is most certainly functional. However, because JavascriptInterface does not extend Activity, I cannot seem to Intent to a new activity using startActivity(intent);

我应该扩展活动吗?是否有另一种意图进行另一项活动的方法? (在我的特例中，我试图使用YouTube应用)

Should I extend Activity? Is there another method to intent to another activity? (in my very special case, im trying to intent to the YouTube app)

package com.privateized.moreprivate;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.util.Log;
import android.widget.Toast;

public class JavaScriptInterface {
    Context mContext;

    /** Instantiate the interface and set the context */
    JavaScriptInterface(Context c) {
        mContext = c;
    }

    /** Show a toast from the web page */
    public void showToast(String toast) {
        Toast.makeText(mContext, toast, Toast.LENGTH_SHORT).show();
    }



    ///// vvvvv This no Worky vvvvv Just crashes ////////
    public void YouTube(String id) {
        Log.d("JS", "Launching YouTube:" + id);
        Activity activity = new Activity();
        String videoId = id;
        Intent i = new Intent(Intent.ACTION_VIEW, Uri.parse("vnd.youtube:"+videoId)); 
        i.putExtra("VIDEO_ID", videoId); 
        Log.d("JS", "Starting Activity");
        activity.startActivity(i);
    }

}

推荐答案

只需使用mContext.startActivity(i);

无需创建活动，也无需扩展活动，只需引用已存储的上下文即可.

No need to ever create Activity and no need to extend Activity, you just need a reference to Context which you already have stored.

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