android 中 Chronometer 计时器的使用

布局：

<Chronometer    android:id="@+id/played_time"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_alignParentLeft="true"    android:textSize="13sp"    android:textColor="@color/music_text_white"    android:text="00:00"/>

代码：

private void countTime() {    if ( mRecordTime != 0 ){        //暂停后继续计时        played_time_view.setBase( played_time_view.getBase() + (SystemClock.elapsedRealtime()-mRecordTime) );    }else if ( isForward ){        //快进 seekTime秒 默认+20s        if ( seekTime > 0 ){            played_time_view.setBase( played_time_view.getBase() - seekTime*1000 );        }else {            played_time_view.setBase( played_time_view.getBase() - 20*1000 );        }        isForward = false;    }else if ( isReverse ){        //快退seekTime秒 默认-20s        long time = 0l;        if ( seekTime > 0 ){            time = played_time_view.getBase() + seekTime*1000;        }else {            time = played_time_view.getBase() + 20*1000;        }        if ( time > SystemClock.elapsedRealtime() ){            played_time_view.setBase( SystemClock.elapsedRealtime() );        }else {            played_time_view.setBase( time );        }        isReverse = false;    }else if ( isJump ){        played_time_view.setBase( SystemClock.elapsedRealtime() - seekTime*1000);        isJump = false;    }else {        //设置时间基点        played_time_view.setBase( SystemClock.elapsedRealtime() );    }    played_time_view.start();}

private void stopCountTime(){    played_time_view.stop();    mRecordTime = SystemClock.elapsedRealtime();}private void resetCountTime(){    played_time_view.setBase( SystemClock.elapsedRealtime() );    played_time_view.stop();    mRecordTime = 0L;    mRecordTime = SystemClock.elapsedRealtime();}

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