使用唤醒锁 [英] Using a wake lock

问题描述

我有，我想还是播放声音，如果手机进入待机睡眠机应用程序。我刚编辑有唤醒锁并将其在清单中添加为好。它不是正常工作，但我不知道为什么。

 包com.androidsleepmachine.gamble;进口android.app.Activity;
进口android.content.Context;
进口android.media.MediaPlayer;
进口android.os.Bundle;
进口android.os.Handler;
进口android.os.PowerManager;
进口android.view.KeyEvent;
进口android.view.View;
进口android.widget.ArrayAdapter;
进口android.widget.Button;
进口android.widget.Spinner;公共类船舶扩展活动实现View.OnClickListener {
公共静态最终整数[] = TIME_IN_MINUTES 30 {45，60，180，360};
公众的MediaPlayer媒体播放器;
公开处理程序处理程序=新的处理程序（）;
公共按钮按钮2;
公共微调spinner2;
私人PowerManager.WakeLock WL;
//初始化活动
@覆盖
公共无效的onCreate（捆绑savedInstanceState）{
super.onCreate（savedInstanceState）;
    super.onCreate（savedInstanceState）;
    的setContentView（R.layout.ship）;
     电源管理PM =（电源管理）getSystemService（Context.POWER_SERVICE）;
     WL = pm.newWakeLock（PowerManager.PARTIAL_WAKE_LOCKDoNjfdhotDimScreen）;
    按钮2 =（按钮）findViewById（R.id.btn2）;
    button2.setOnClickListener（本）;
    spinner2 =（微调）findViewById（R.id.spinner2）;
    ArrayAdapter＆LT;整数GT;适配器=新ArrayAdapter＆LT;整数GT;（这一点，
android.R.layout.simple_spinner_item，TIME_IN_MINUTES）;adapter.setDropDownViewResource（android.R.layout.simple_spinner_dropdown_item）;
    spinner2.setAdapter（适配器）;
}//播放声音，并开始计时
私人无效playSound（INT RESOURCEID）{
    //清除任何previous声音文件
    清理（​​）;
    //创建一个新的媒体播放器实例并启动它
    媒体播放器= MediaPlayer.create（这一点，RESOURCEID）;
    mediaPlayer.start（）;
    //创建计时器停止后的毫秒x个声音
    INT selectedTime = TIME_IN_MINUTES [spinner2.getSelectedItemPosition（）];
    handler.postDelayed（可运行，selectedTime * 60 * 1000）;
}//手柄按钮回调
@覆盖
公共无效的onClick（视图v）{
    开关（v.getId（））{
        案例R.id.btn2：
            playSound（R.raw.ocean_ship）;
            打破;
    }
}
 保护无效的onStop（）
  {      清理（​​）;
      super.onStop（）;
  }
//停止声音和清理媒体播放器
公共无效清除（）{
    如果（媒体播放器！= NULL）{
        mediaPlayer.stop（）;
        mediaPlayer.release（）;
        媒体播放器= NULL;
         wl.release（）;
    }
    // pviously取消任何$ P $正在运行的任务
    handler.removeCallbacks（可运行）;
}//由处理程序使用的Runnable任务停止声音
公众可运行的可运行=新的Runnable（）{
    公共无效的run（）{
        清理（​​）;
    }
};
}
 

解决方案

您可以把它与唤醒锁定发生。其电源管理API 的一部分。

一个详细的解释可以发现这里

I have a sleep machine app that I want to still play the sound if the phone goes into stand by. I just edited to have the wake lock added and it is added in the manifest as well. It isnt working correctly but I am not sure why.

package com.androidsleepmachine.gamble;

import android.app.Activity; 
import android.content.Context;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.Handler;
import android.os.PowerManager;
import android.view.KeyEvent;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;

public class Ship extends Activity implements View.OnClickListener {
public static final Integer[] TIME_IN_MINUTES = { 30, 45, 60, 180, 360 };
public MediaPlayer mediaPlayer;
public Handler handler = new Handler();
public Button button2;
public Spinner spinner2;
private PowerManager.WakeLock wl;
// Initialize the activity
@Override
public void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState);
    super.onCreate(savedInstanceState);
    setContentView(R.layout.ship);
     PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
     wl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "DoNjfdhotDimScreen");


    button2 = (Button) findViewById(R.id.btn2);
    button2.setOnClickListener(this);
    spinner2 = (Spinner) findViewById(R.id.spinner2);
    ArrayAdapter<Integer> adapter = new ArrayAdapter<Integer>(this,   
android.R.layout.simple_spinner_item, TIME_IN_MINUTES);

adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);          
    spinner2.setAdapter(adapter); 
}

// Play the sound and start the timer
private void playSound(int resourceId) {
    // Cleanup any previous sound files
    cleanup();
    // Create a new media player instance and start it
    mediaPlayer = MediaPlayer.create(this, resourceId);
    mediaPlayer.start();
    // Create the timer to stop the sound after x number of milliseconds
    int selectedTime = TIME_IN_MINUTES[spinner2.getSelectedItemPosition()];
    handler.postDelayed(runnable, selectedTime * 60 * 1000);
}

// Handle button callback
@Override
public void onClick(View v) {
    switch (v.getId()) {
        case R.id.btn2:
            playSound(R.raw.ocean_ship);
            break;
    }
}
 protected void onStop()
  {

      cleanup();
      super.onStop();
  }
// Stop the sound and cleanup the media player
public void cleanup() {
    if (mediaPlayer != null) {
        mediaPlayer.stop();
        mediaPlayer.release();
        mediaPlayer = null;
         wl.release();
    }
    // Cancel any previously running tasks
    handler.removeCallbacks(runnable);
}

// Runnable task used by the handler to stop the sound
public Runnable runnable = new Runnable() {
    public void run() {
        cleanup();
    }
};
}

解决方案

You can make it happen with wake locks. Its part of the Powermanager api.

A detailed explanation can be found here.

这篇关于使用唤醒锁的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！