对象在notify（）之前未被线程锁定

Question

我正在制作应用程序，用于听取.mp3单词的希腊语，所以我有媒体播放器，然后让我们说1000ms它应该显示下一个字取决于.mp3文件所以我有3个功能播放，暂停和停止..我需要暂停线程然后在它结束时继续。在我的线程是不工作暂停方法通过调用通知我只是不知道如何锁定对象之前调用notify（）..这是我的代码我会很高兴每一个帮助..

   class MyinnerThread implements Runnable  {
    String name;
    Thread tr;
    boolean suspendFlag;
    int i = 0;

    MyinnerThread(String threadname) {
        name = threadname;
        tr = new Thread(this, name);
        suspendFlag = false;
        tr.start();
    }

    public void run() {
        try {

            runOnUiThread(new Runnable() {
                @Override
                public void run() {

                    if(i == 0){tv1.setText("trhead1");}
                    if(i == 1){tv2.setText("trhead2");}
                    if(i == 2){tv3.setText("trhead3");}
                    if(i == 3){tv4.setText("trhead4");}
                    if(i == 4){tv5.setText("trhead5");}
                    if(i == 5){tv6.setText("trhead6");}
                    if(i == 6){tv7.setText("trhead7");}
                    if(i == 7){tv8.setText("trhead8");}

                    try {
                        Thread.sleep(800);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    synchronized(this) {
                        while(suspendFlag) {
                            try {
                                tr.wait();
                            } catch (InterruptedException e) {
                                e.printStackTrace();
                            }
                        }
                    }
                    i++;
                }
            });
            Thread.sleep(200);

        } catch (InterruptedException e) {
            System.out.println(name + " interrupted.");
        }
    }
    void mysuspend() {
        suspendFlag = true;
    }

    synchronized void myresume() {
        suspendFlag = false;
        tr.notify();
}

}

 @Override
public void onClick(View v) {
    switch(v.getId()){
        case R.id.play:
            if(mp.isPlaying()){
                mp.pause();
                play.setBackgroundResource(R.drawable.play);

                t.mysuspend();

                Toast.makeText(getApplicationContext(), "Pause", Toast.LENGTH_SHORT).show();
            }
            else if(!mp.isPlaying()){
                mp.start();

                if(runningThread){
                    t.myresume();
                }

                if(!runningThread){
                    runningThread = true;

                    t = new MyinnerThread("name");

                    try {
                        Thread.sleep(500);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }

                Toast.makeText(getApplicationContext(), "Play", Toast.LENGTH_SHORT).show();
                play.setBackgroundResource(R.drawable.pause);
            }
            break;

        case R.id.stop:
            Toast.makeText(getApplicationContext(), "Stop", Toast.LENGTH_SHORT).show();
            mp.release();

            Thread.currentThread().interrupt();
            t = null;

            runningThread = false;

            setPlayer();
            play.setBackgroundResource(R.drawable.play);
            break;
    }
}