Question

Android新手。

我正在尝试创建一个应用程序，每隔一段时间发出一声蜂鸣声。屏幕上有一个简单的播放按钮，它调用readyToBeep函数，该函数调用Beep.class。我没有得到错误，它编译并运行。但是我听不到MP3的声音。调用的活动ID和布局更改为buzz.xml，但我不确定我哪里出错，因为我没有收到任何错误消息。有什么迹象表明问题是什么？

TIA

MainActivity.java

package com.example.timer;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void readyToBeep(View v) {
        Intent intent = new Intent(this, Beep.class);
        startActivity(intent);  
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}

Beep.java

package com.example.timer;

import java.util.Timer;
import java.util.TimerTask;
import android.app.Activity;
import android.content.Context;
import android.media.AudioManager;
import android.media.MediaPlayer;

public class Beep extends Activity  {

    @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.buzz); 
     new Beep();
} 

    private Context Context;
    Timer timer;

    public Beep(){};

    public Beep(Context Context) {

        this.Context = Context;
        timer = new Timer();
        timer.schedule(new RemindTask(),
                       1500,        //initial delay
                       1*1500);  //subsequent rate
        }

        class RemindTask extends TimerTask {

            public void run() {

                MediaPlayer mPlayer = MediaPlayer.create(Context, R.raw.beep);  
                mPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
                mPlayer.start();

            }
        }
    }

现在正在使用Beep.java（感谢MagicCode）

package com.example.timer;

import java.util.Timer;
import java.util.TimerTask;

import android.app.Activity;
import android.content.Context;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.os.Bundle;



public class Beep extends Activity  {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.buzz); 

    timer = new Timer();
    timer.scheduleAtFixedRate(new RemindTask(),
               1500,        //initial delay
               1*1500);  //subsequent rate
    }

         Timer timer;

 public Beep(){};



     class RemindTask extends TimerTask {

                    public void run() {

                MediaPlayer mPlayer = MediaPlayer.create(getApplicationContext(), R.raw.beep);  
                mPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
                mPlayer.start();

            }
      }
 }

Answer 1

这永远不会运行

public final void main() {

setContentView(R.layout.buzz); 
     new Beep();
}

这是Android，因此您需要覆盖onCreate()，就像在第一个Activity中一样。尝试

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.buzz); 
     new Beep();
}

定时器代码编译但无法正常工作

1 个答案: