Toast和startActivity在片段中工作，但不在类中工作

Question

TerminalFragment.java

receiveText.append(toCaretString(msg, newline.length() != 0));            
        Task(msg);
        // If I put the Intent and startActivity(play) here it works fine
    }
}

public void Task(String tsk) {
//  String id = tsk.substring(0, 2);
    String id = "01";
    String[] smallString = StringUtils.substringsBetween(tsk, ";", ";");

    switch (id)
    {
    // VLC
    case "01":
       VLC myObj = new VLC();
        myObj.RadioStream(smallString);
        break;
    case "02":
        Toast.makeText(getActivity(), id, Toast.LENGTH_SHORT).show();
        break;
    default:
       Toast.makeText(getActivity(), "default", Toast.LENGTH_SHORT).show();
        break;
    }
}

VLC.Java

package com.android_usb_gateway;

import android.content.Intent;
import android.net.Uri;
import android.widget.Toast;

public class VLC extends MainActivity {

public void RadioStream(String[] args) {

    // Can not get the Toast to work
    Toast.makeText(getApplicationContext(), "hello", Toast.LENGTH_SHORT).show();

    // Get the name and url
    String url = args[2];
    String name = args[3];
    String AUDIO_WILD = args[4];
    String TITLE = args[5];

    // The intent and startActivity(play) work fine if they are in   TerminalFrament.java
    Intent play = new Intent(Intent.ACTION_VIEW);
    Uri uri = Uri.parse(url);
    play.setPackage(MainActivity.app);
    play.setDataAndType(uri, AUDIO_WILD);
    play.putExtra(TITLE, name);

    // Can not get this to work
    startActivity(play);
  }
}

Answer 1

我刚刚测试了上面的VLC类和RadioStream方法工作中的Toast

我认为问题与如何在onCreate中调用方法有关。

确保你不是在做

new VLC().RadioStream()