onLongClickListener发布android

我试图通过以下方式指示用户何时释放长时间单击--

Java代码：

package com.time.reactiontime;

import com.time.reactiontime.R;

import android.app.*;
import android.os.*;
import android.view.*;
import android.widget.*;
import android.media.*;

import java.io.*;
import java.util.*;

public class MainActivity extends Activity {
    private int time;
    private int militime;
    private int Timecounter = 0;
    private TextView textview;
    private Button button1;
    private boolean isSpeakButtonLongPressed = false;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_main);
        textview = ((TextView) findViewById(R.id.textview));
        final Button button1 = (Button) findViewById(R.id.button1);
        button1.setOnLongClickListener(speakHoldListener);
        button1.setOnTouchListener(speakTouchListener);

    }

    private View.OnLongClickListener speakHoldListener = new View.OnLongClickListener() {

        @Override
        public boolean onLongClick(View pView) {
            final Random rand = new Random();
            time = rand.nextInt(15) + 1;
            militime = time * 1000;
            new CountDownTimer(militime, 1000) {
                public void onTick(long millisUntilFinished) {
                    button1.setText("Wait for sound and release");
                }

                public void onFinish() {
                    SoundPool sp = new SoundPool(5, AudioManager.STREAM_MUSIC,
                            0);
                    int soundId = sp.load(getBaseContext(),
                            R.raw.windows_8_notify, 1);
                    sp.play(soundId, 1, 1, 0, 0, 1);
                    MediaPlayer mPlayer = MediaPlayer.create(getBaseContext(),
                            R.raw.windows_8_notify);
                    try {
                        mPlayer.prepare();
                    } catch (IllegalStateException e) {
                    } catch (IOException e) {
                    }
                    mPlayer.start();
                    Timer t = new Timer();
                    TimerTask task = new TimerTask() {
                        @Override
                        public void run() {
                            runOnUiThread(new Runnable() {
                                @Override
                                public void run() {
                                    Timecounter++;
                                }
                            });
                        }
                    };
                    t.scheduleAtFixedRate(task, 0, 1000);
                }
            }.start();
            isSpeakButtonLongPressed = true;
            return true;
        }
    };

    private View.OnTouchListener speakTouchListener = new View.OnTouchListener() {

        @Override
        public boolean onTouch(View pView, MotionEvent pEvent) {
            pView.onTouchEvent(pEvent);
            if (pEvent.getAction() == MotionEvent.ACTION_UP) {
                if (isSpeakButtonLongPressed) {
                    textview.setText("" + Timecounter);
                    isSpeakButtonLongPressed = false;
                }
            }
            return false;
        }
    };
}

我试着做一个反应时间的小游戏，当你长按它，在随机数秒后，它会发出声音，当你听到声音时，当声音产生时，你必须松开按钮，它还创建了一个计时器，当你松开按钮时，它会告诉你听到声音和松开按钮需要多少时间

我的问题是，代码不工作，我在logcat中得到错误：

08-13 16:05:01.728: E/AndroidRuntime(1173): FATAL EXCEPTION: main
08-13 16:05:01.728: E/AndroidRuntime(1173): Process: com.time.reactiontime, PID: 1173
08-13 16:05:01.728: E/AndroidRuntime(1173): java.lang.NullPointerException
08-13 16:05:01.728: E/AndroidRuntime(1173):     at com.time.reactiontime.MainActivity$1$1.onTick(MainActivity.java:42)
08-13 16:05:01.728: E/AndroidRuntime(1173):     at android.os.CountDownTimer$1.handleMessage(CountDownTimer.java:124)
08-13 16:05:01.728: E/AndroidRuntime(1173):     at android.os.Handler.dispatchMessage(Handler.java:102)
08-13 16:05:01.728: E/AndroidRuntime(1173):     at android.os.Looper.loop(Looper.java:136)
08-13 16:05:01.728: E/AndroidRuntime(1173):     at android.app.ActivityThread.main(ActivityThread.java:5118)
08-13 16:05:01.728: E/AndroidRuntime(1173):     at java.lang.reflect.Method.invokeNative(Native Method)
08-13 16:05:01.728: E/AndroidRuntime(1173):     at java.lang.reflect.Method.invoke(Method.java:515)
08-13 16:05:01.728: E/AndroidRuntime(1173):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:794)
08-13 16:05:01.728: E/AndroidRuntime(1173):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:610)
08-13 16:05:01.728: E/AndroidRuntime(1173):     at dalvik.system.NativeStart.main(Native Method)

错误在这一行“button1.setTextWait for sound and release”；但是当我试图删除这一行时，它给出了另一个错误

我怎样才能修好它

public class MainActivity extends Activity {
    private int time;
    private int militime;
    private int Timecounter = 0;
    private TextView textview;
    private Button button1;
    private boolean isSpeakButtonLongPressed = false;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_main);
        textview = ((TextView) findViewById(R.id.textview));
        ***final Button button1*** = (Button) findViewById(R.id.button1);
        button1.setOnLongClickListener(speakHoldListener);
        button1.setOnTouchListener(speakTouchListener);

    }

您忽略了全局按钮1，而选择了本地按钮

将此用作oncreate

@Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.fragment_main);
            textview = ((TextView) findViewById(R.id.textview));
            button1 = (Button) findViewById(R.id.button1);
            button1.setOnLongClickListener(speakHoldListener);
            button1.setOnTouchListener(speakTouchListener);

        }

---

首先声明两个按钮对象，一个是全局对象，一个是本地对象，作为最终对象 所以请删除本地一个使用全局一个

复制粘贴我下面的代码它肯定会工作

import com.time.reactiontime.R;

import android.app.*;
import android.os.*;
import android.view.*;
import android.widget.*;
import android.media.*;

import java.io.*;
import java.util.*;

public class MainActivity extends Activity {
    private int time;
    private int militime;
    private int Timecounter = 0;
    private TextView textview;
    private Button button1;
    private boolean isSpeakButtonLongPressed = false;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_main);
        textview = ((TextView) findViewById(R.id.textview));
        button1 = (Button) findViewById(R.id.button1);
        button1.setOnLongClickListener(speakHoldListener);
        button1.setOnTouchListener(speakTouchListener);

    }

    private View.OnLongClickListener speakHoldListener = new View.OnLongClickListener() {

        @Override
        public boolean onLongClick(View pView) {
            final Random rand = new Random();
            time = rand.nextInt(15) + 1;
            militime = time * 1000;
            new CountDownTimer(militime, 1000) {
                public void onTick(long millisUntilFinished) {
                    button1.setText("Wait for sound and release");
                }

                public void onFinish() {
                    SoundPool sp = new SoundPool(5, AudioManager.STREAM_MUSIC,
                            0);
                    int soundId = sp.load(getBaseContext(),
                            R.raw.windows_8_notify, 1);
                    sp.play(soundId, 1, 1, 0, 0, 1);
                    MediaPlayer mPlayer = MediaPlayer.create(getBaseContext(),
                            R.raw.windows_8_notify);
                    try {
                        mPlayer.prepare();
                    } catch (IllegalStateException e) {
                    } catch (IOException e) {
                    }
                    mPlayer.start();
                    Timer t = new Timer();
                    TimerTask task = new TimerTask() {
                        @Override
                        public void run() {
                            runOnUiThread(new Runnable() {
                                @Override
                                public void run() {
                                    Timecounter++;
                                }
                            });
                        }
                    };
                    t.scheduleAtFixedRate(task, 0, 1000);
                }
            }.start();
            isSpeakButtonLongPressed = true;
            return true;
        }
    };

    private View.OnTouchListener speakTouchListener = new View.OnTouchListener() {

        @Override
        public boolean onTouch(View pView, MotionEvent pEvent) {
            pView.onTouchEvent(pEvent);
            if (pEvent.getAction() == MotionEvent.ACTION_UP) {
                if (isSpeakButtonLongPressed) {
                    textview.setText("" + Timecounter);
                    isSpeakButtonLongPressed = false;
                }
            }
            return false;
        }
    };
}

---

你知道什么是NullPointerException吗？随机删除行不是很有条理。理解您的问题。删除导致问题的行不是随机的。我最喜欢的方法是通过破坏更多的东西来调试。brother总是试图理解您的问题，更好的方法是使用调试器，如果您仍然无法找到解决方案，请继续stackoverflow@keyser事实上我不知道是什么：@r2DoesInc我只是删除了它，试图了解什么是我还不能理解的问题：因为我是新的说要等8分钟：P@Gadab确保您了解什么是错误的以及为什么这样做有效。