Android的MediaPlayer的实时快进和快退按钮实现使用可运行 [英] Android MediaPlayer real time fastforward and rewind button implementation using runnable

问题描述

我需要帮助，这却没有真正找到明确的指示。如何创建一个按钮，将快进和暂停快退当前歌曲。

请参阅答案

解决方案

 专用处理器repeatUpdateHandler =新的处理程序（）;
公众诠释mValue; //增量
私人布尔mAutoIncrement = FALSE; //用于实时快速向前的
私人布尔mAutoDecrement = FALSE; //用于实时倒带私有类RptUpdater实现Runnable {
        公共无效的run（）{
            如果（mAutoIncrement）{
                mValue + = 30; //改变这个值来控制多少转发
                mediaPlayer.seekTo（getCurrentPosition（）+ mValue）;
                repeatUpdateHandler.postDelayed（新RptUpdater（），50）;
            }否则如果（mAutoDecrement）{
                mValue  -  = 30; //改变这个值来控制多少倒带
                seekTo（getCurrentPosition（） -  mValue）;
                repeatUpdateHandler.postDelayed（新RptUpdater（），50）;
            }
        }
    }BTN prev.setOnTouchListener（新View.OnTouchListener（）{
            @覆盖
            公共布尔onTouch（视图V，MotionEvent事件）{
                如果（event.getAction（）== MotionEvent.ACTION_DOWN）{
                    v.set pressed（真）;
                    mAutoDecrement = TRUE;
                    repeatUpdateHandler.post（新RptUpdater（））;
                    返回false;
                }
                否则如果（event.getAction（）== MotionEvent.ACTION_UP）{
                    v.set pressed（假）;
                    如果（（event.getAction（）== MotionEvent.ACTION_UP || event.getAction（）== MotionEvent.ACTION_CANCEL）
                            ＆功放;＆安培; mAutoDecrement）{
                        mAutoDecrement = FALSE;
                    }
                    返回false;
                }
                返回false;
            }
        }）;btnNext.setOnTouchListener（新View.OnTouchListener（）{
            @覆盖
            公共布尔onTouch（视图V，MotionEvent事件）{
                如果（event.getAction（）== MotionEvent.ACTION_DOWN）{
                    v.set pressed（真）;
                    mAutoIncrement = TRUE;
                    repeatUpdateHandler.post（新RptUpdater（））;
                    返回false;
                }
                否则如果（event.getAction（）== MotionEvent.ACTION_UP）{
                    v.set pressed（假）;
                    如果（（event.getAction（）== MotionEvent.ACTION_UP || event.getAction（）== MotionEvent.ACTION_CANCEL）
                            ＆功放;＆安培; mAutoIncrement）{
                        mAutoIncrement = FALSE;
                    }
                    返回false;
                }                返回false;
            }
        }）;
 

I needed help with this but didn't really find clear instructions. How to create a button that will fast forward and rewind current song on hold.

Please see answer

解决方案

private Handler repeatUpdateHandler = new Handler();
public int mValue;           //increment 
private boolean mAutoIncrement = false;          //for fast foward in real time
private boolean mAutoDecrement = false;         // for rewind in real time



private class RptUpdater implements Runnable {
        public void run() {
            if( mAutoIncrement ){
                mValue += 30; //change this value to control how much to forward
                mediaPlayer.seekTo(getCurrentPosition()+ mValue);
                repeatUpdateHandler.postDelayed( new RptUpdater(), 50 );
            } else if( mAutoDecrement ){
                mValue -= 30; //change this value to control how much to rewind
                seekTo(getCurrentPosition()- mValue);
                repeatUpdateHandler.postDelayed( new RptUpdater(), 50 );
            }
        }
    }



btnPrev.setOnTouchListener(new View.OnTouchListener() { 
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                if(event.getAction() == MotionEvent.ACTION_DOWN) {
                    v.setPressed(true);
                    mAutoDecrement = true;
                    repeatUpdateHandler.post( new RptUpdater() );
                    return false;
                }
                else if(event.getAction() == MotionEvent.ACTION_UP) {
                    v.setPressed(false);
                    if( (event.getAction()==MotionEvent.ACTION_UP || event.getAction()==MotionEvent.ACTION_CANCEL)
                            && mAutoDecrement ){
                        mAutoDecrement = false;
                    }
                    return false;
                }
                return false;
            }
        });

btnNext.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                if(event.getAction() == MotionEvent.ACTION_DOWN) {
                    v.setPressed(true);
                    mAutoIncrement = true;
                    repeatUpdateHandler.post( new RptUpdater() );
                    return false;
                }
                else if(event.getAction() == MotionEvent.ACTION_UP) {
                    v.setPressed(false);
                    if( (event.getAction()==MotionEvent.ACTION_UP || event.getAction()==MotionEvent.ACTION_CANCEL)
                            && mAutoIncrement ){
                        mAutoIncrement = false;
                    }
                    return false;
                }

                return false;
            }
        });

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