上下文不recognisied：方法不适用于参数 [英] Context not recognisied:Method not applicable for arguments
问题描述
我试图做一个计时器在我的Android应用程序播放MP3文件每1.5秒（嘟嘟声）。我有以下的code和收到错误，在类型的MediaPlayer的方法来创建（背景下，INT）不适用于参数（Beep.RemindTask，INT）下面我运行功能：
I'm trying to make a timer to play an MP3 file every 1.5 seconds(a beep) in my android application. I have the following code and receive the error "The method create (context,int) in the type MediaPlayer is not applicable for the arguments (Beep.RemindTask,int)" in my run function below:
package com.example.timer;
import java.util.Timer;
import java.util.TimerTask;
import android.media.AudioManager;
import android.media.MediaPlayer;
public class Beep {
Timer timer;
public Beep() {
timer = new Timer();
timer.schedule(new RemindTask(),
0, //initial delay
1*1500); //subsequent rate
}
class RemindTask extends TimerTask {
public void run() {
MediaPlayer mPlayer = MediaPlayer.create(this, R.raw.beep);
mPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mPlayer.start();
}
}
public void main(String args[]) {
new Beep();
}
}
我不明白为什么它不适用，这些参数是一样的吗？我知道它可能是与上下文，这我不能完全肯定，但是从这里：的什么是Android中语境？我知道他们正在创造新的对象或访问共享公共资源时使用。我曾尝试 getApplicationContext（），的getContext（）和 getBaseContext（），但仍收到错误。我相信，通过蜂鸣对象进行操作所需的所有位于这一背景下。任何建议或想法？
I don't understand why it isn't applicable, the parameters being the same? I know its probably something to do with the context, which I am not entirely sure of, but from here: What is Context in Android? I know they are used when creating new objects or accessing shared common resources. I have tried getApplicationContext(),getContext() and getBaseContext() but still receive errors. I believe that everything needed by the beep object to operate is located in this context. Any suggestions or ideas?
推荐答案
您类是一种非活性类，所以你不能直接在场景中获得。当您从您的活动实例提示音的一个实例，通过在constuctor活动的背景。
Your class is a non-activity class so you can't directly get at a context. When you instantiate an instance of Beep from your activity, pass in the activity's context in the constuctor.
一个变量添加到您的蜂鸣类来保存上下文：
Add a variable to your Beep class to hold a context:
private Context context;
在构造函数中，其存储：
In the constructor, store it:
public Beep(Context context) {
this.context=context;
//the rest of your constructor code...
}
然后，你可以这样做：
Then you can do this:
MediaPlayer mPlayer = MediaPlayer.create(context, R.raw.beep);
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