Question

我创建了一个应用程序，点击按钮说[next]。我正在调用一种方法，这种方法的工作是生成5个随机数并随机设置为5个按钮，点击每个按钮它将随机选择一个小的（2秒）音频文件并播放它。如果我点击[next]按钮超过8次，我的整个应用程序都会重新启动。

logcat未显示任何错误...

TextView addNo1, addNo2;
Button option1, option2, option3, option4, next;
Random randomGenerator;
Integer randomInt1, randomInt2;
int flag = 0, setans;
MediaPlayer wa1,wa2,wa3,wa4,wa5,wa6,wa7;
MediaPlayerHelper m;
MediaPlayer mp1, mp2, mp3, mp4, mp5, mp6, mp7, mp8, mp9, mp10, mp11, mp12,
        mp13, mp14, mp15, mp16, mp17, mp18, mp19, mp20;
int correctmusiclist[] = { R.raw.correct1, R.raw.correct2, R.raw.correct3,
        R.raw.correct4, R.raw.correct5, R.raw.correct6, R.raw.correct7,
        R.raw.correct8, R.raw.correct9, R.raw.correct10, R.raw.correct11,
        R.raw.correct12, R.raw.correct13, R.raw.correct14, R.raw.correct15 };
int wrongmusiclist[] = {R.raw.wrong1,R.raw.wrong2,R.raw.wrong3,R.raw.wrong4,R.raw.wrong5,R.raw.wrong6,
        R.raw.wrong7}; 
Context context = Addition.this;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.additionactivity);
    addNo1 = (TextView) findViewById(R.id.textView1);
    addNo2 = (TextView) findViewById(R.id.textView2);
    option1 = (Button) findViewById(R.id.addoption1);
    option2 = (Button) findViewById(R.id.addoption2);
    option3 = (Button) findViewById(R.id.addoption3);
    option4 = (Button) findViewById(R.id.addoption4);
    next = (Button) findViewById(R.id.button1);
    next.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            nextChangeAdd();
        }
    });
    m = new MediaPlayerHelper(Addition.this);
    randomGenerator = new Random();
    Typeface tf = Typeface.createFromAsset(getAssets(),
            "fonts/StefanieDots.ttf");
    addNo1.setTypeface(tf);
    nextChangeAdd();

}

public void nextChangeAdd() {
    randomInt1 = randomGenerator.nextInt(10);
    randomInt2 = randomGenerator.nextInt(10);
    setans = randomGenerator.nextInt(5);
    if (setans == 0) {
        setans++;
    }
    int ans = randomInt1 + randomInt2;
    String addans = Integer.toString(ans);
    addNo1.setText(randomInt1.toString());
    addNo2.setText(randomInt2.toString());
    List<Integer> generated = new ArrayList<Integer>();
    for (int i = 0; i < 3; i++) {
        while (true) {
            Integer next = randomGenerator.nextInt(19) + 1;
            if (!generated.contains(ans)) {
                generated.add(next);
                break;
            }
        }
    }

    switch (setans) {
    case 1:
        flag = 1;
        option1.setText(addans);
        option1.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                getAudio();
            }
        });

        break;
    case 2:
        flag = 2;
        option2.setText(addans);
        option2.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                getAudio();
            }
        });

        break;
    case 3:
        flag = 3;
        option3.setText(addans);
        option3.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                getAudio();
            }
        });
        break;
    case 4:
        flag = 4;
        option4.setText(addans);
        option4.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                getAudio();
            }
        });
                    break;
    }
    String a2 = generated.get(0).toString();
    String a3 = generated.get(1).toString();
    String a4 = generated.get(2).toString();

    if (flag == 1) {
        option2.setText(a2);
        option2.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                wrongAns();
            }
        });
        option3.setText(a3);
        option3.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                wrongAns();
            }
        });
        option4.setText(a4);
        option4.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                wrongAns();
            }
        });
    }
    if (flag == 2) {
        option1.setText(a2);
        option2.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                wrongAns();
            }
        });
        option3.setText(a3);
        option3.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                wrongAns();
            }
        });
        option4.setText(a4);
        option4.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                wrongAns();
            }
        });
    }
    if (flag == 3) {
        option2.setText(a2);
        option2.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                wrongAns();
            }
        });
        option1.setText(a3);
        option1.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                wrongAns();
            }
        });
        option4.setText(a4);
        option4.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                wrongAns();
            }
        });
    }

    if (flag == 4) {
        option2.setText(a2);
        option2.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                wrongAns();
            }
        });
        option3.setText(a3);
        option3.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                wrongAns();
            }
        });
        option1.setText(a4);
        option1.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                wrongAns();
            }
        });
    }
}

public void getAudio() {
    Random randomGenerator = new Random();
    int i = randomGenerator.nextInt(10);
    mp1 = MediaPlayer.create(context, correctmusiclist[0]);
    mp2 = MediaPlayer.create(context, correctmusiclist[1]);
    mp3 = MediaPlayer.create(context, correctmusiclist[2]);
    mp4 = MediaPlayer.create(context, correctmusiclist[3]);
    mp5 = MediaPlayer.create(context, correctmusiclist[4]);
    mp6 = MediaPlayer.create(context, correctmusiclist[5]);
    mp7 = MediaPlayer.create(context, correctmusiclist[6]);
    mp8 = MediaPlayer.create(context, correctmusiclist[7]);
    mp9 = MediaPlayer.create(context, correctmusiclist[8]);
    mp10 = MediaPlayer.create(context, correctmusiclist[9]);
    mp11 = MediaPlayer.create(context, correctmusiclist[10]);
    mp12 = MediaPlayer.create(context, correctmusiclist[11]);
    mp13 = MediaPlayer.create(context, correctmusiclist[12]);
    mp14 = MediaPlayer.create(context, correctmusiclist[13]);
    mp15 = MediaPlayer.create(context, correctmusiclist[14]);
    switch (i) {
    case 1:
        mp1.start();
        break;
    case 2:
        mp2.start();
        break;
    case 3:
        mp3.start();
        break;
    case 4:
        mp4.start();
        break;
    case 5:
        mp5.start();
        break;
    case 6:
        mp6.start();
        break;
    case 7:
        mp7.start();
        break;
    case 8:
        mp8.start();
        break;
    case 9:
        mp9.start();
        break;
    case 10:
        mp10.start();
        break;
    case 11:
        mp11.start();
        break;
    case 12:
        mp12.start();
        break;
    case 13:
        mp13.start();
        break;
    case 14:
        mp14.start();
        break;
    case 15:
        mp15.start();
        break;
    default:
        mp10.start();
    }

}

public void wrongAns()
{
    Random randomGenerator = new Random();
    int i = randomGenerator.nextInt(10);
    wa1 = MediaPlayer.create(context, wrongmusiclist[0]);
    wa2 = MediaPlayer.create(context, wrongmusiclist[1]);
    wa3 = MediaPlayer.create(context, wrongmusiclist[2]);
    wa4 = MediaPlayer.create(context, wrongmusiclist[3]);
    wa5 = MediaPlayer.create(context, wrongmusiclist[4]);
    wa6 = MediaPlayer.create(context, wrongmusiclist[5]);
    wa7 = MediaPlayer.create(context, wrongmusiclist[6]);
    switch (i) {
    case 1:
        wa1.start();
        break;
    case 2:
        wa2.start();
        break;
    case 3:
        wa3.start();
        break;
    case 4:
        wa4.start();
        break;
    case 5:
        wa5.start();
        break;
    case 6:
        wa6.start();
        break;
    case 7:
        wa7.start();
        break;
    default:
        wa7.start();
}

} }

Answer 1

首先在getAudio（）和wrongAns（）内部播放随机音频是完全错误的，因为你通过创建如此多的MediaPlayer对象来完全搞乱它。这里你需要在随机数生成时只创建一个MediaPlayer对象并在switch case中播放声音。像这样的东西

 Random randomGenerator = new Random();
 int i = randomGenerator.nextInt(10);


switch (i) {
case 1:
    wa1 = MediaPlayer.create(context, wrongmusiclist[1]);
    wa1.start();
    break;
case 2: 
    wa1 = MediaPlayer.create(context, wrongmusiclist[2]);
    wa1.start();
    break;

并将wa1作为类级别变量。

<强>更新使用此功能播放音频

public void playBeep() {
try {

    if (m.isPlaying()) {
        m.stop();
        m.release();
        m = new MediaPlayer();
    }
    AssetFileDescriptor descriptor = getAssets().openFd("beepbeep.mp3");
    m.setDataSource(descriptor.getFileDescriptor(), descriptor.getStartOffset(), descriptor.getLength());
    descriptor.close();

    m.prepare();
    m.setVolume(1f, 1f);
    m.setLooping(true);
    m.start();
} catch (Exception e) {
}
}

并将文件路径存储在字符串数组中。并将此函数传递给随机数，并从数组中选择随机索引到不同的文件路径。

Android应用程序崩溃？

1 个答案: