Android的麻烦与TextViews和按钮

Question

我正在制作一个应用程序，它在屏幕上弹出一个随机数。如果你按下的数字与随机数字相同，你会得到一分，如果你按下的数字不正确，你会失去一分。问题是你只有10秒的时间来获得足够的分数(我没有检查用户是否获得足够的分数来获胜)。无论如何，我对这个应用程序有两个主要问题。计时器不会显示在屏幕上，除非应用程序崩溃(我设置了一个try/catch来阻止它崩溃，这样我就可以做其他事情了)，当你点击正确的按钮时，你的分数不会上升。但是，如果你按错了按钮，分数就会下降。我觉得这很奇怪。

谢谢你的帮助!

这是我的活动类:

package ab.game.crazynumbers;
import java.util.Random;
import java.util.Timer;
import java.util.TimerTask;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class Level1Activity extends Activity {
Random r;
Timer t;
int random;
int time;
boolean running = false;
TextView showingnumber;
TextView score;
TextView timer;
Handler handler;
Button b1;
Button b2;
Button b3;
Button b4;
Button b5;
Button b6;
Button b7;
Button b8;
Button b9;
Button b0;
int playerscore;
TextView finalscore;
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.level_1);
    playerscore = 0;
    showingnumber = (TextView) findViewById(R.id.game_number);
    score = (TextView) findViewById(R.id.game_score);
    timer = (TextView) findViewById(R.id.game_timer2);
    finalscore = (TextView) findViewById(R.id.finalscore);
    running = true;
    time = 10;
    b0 = (Button) findViewById(R.id.b1_0);
    b1 = (Button) findViewById(R.id.b1_1);
    b2 = (Button) findViewById(R.id.b1_2);
    b3 = (Button) findViewById(R.id.b1_3);
    b4 = (Button) findViewById(R.id.b1_4);
    b5 = (Button) findViewById(R.id.b1_5);
    b6 = (Button) findViewById(R.id.b1_6);
    b7 = (Button) findViewById(R.id.b1_7);
    b8 = (Button) findViewById(R.id.b1_8);
    b9 = (Button) findViewById(R.id.b1_9);
    randomnumber();
    b1.setOnTouchListener(new View.OnTouchListener() {
        public boolean onTouch(View v, MotionEvent e) {
            if (e.getAction() == android.view.MotionEvent.ACTION_UP) {
                if (1 == random) {
                    playerscore++;
                    runOnUiThread(new Runnable() {
                        public void run() {
                            score.setText("Your Score Is " + playerscore);
                        }
                    });
                    randomnumber();
                }
                if (1 != random) {
                    playerscore--;
                    runOnUiThread(new Runnable() {
                        public void run() {
                            score.setText("Your Score Is " + playerscore);
                        }
                    });
                    randomnumber();
                }
            }
            return false;
        }
    });
    b2.setOnTouchListener(new View.OnTouchListener() {
        public boolean onTouch(View v, MotionEvent e) {
            if (e.getAction() == android.view.MotionEvent.ACTION_UP) {
                if (2 == random) {
                    playerscore++;
                    runOnUiThread(new Runnable() {
                        public void run() {
                            score.setText("Your Score Is " + playerscore);
                        }
                    });
                    randomnumber();
                }
                if (2 != random) {
                    playerscore--;
                    runOnUiThread(new Runnable() {
                        public void run() {
                            score.setText("Your Score Is " + playerscore);
                        }
                    });
                    randomnumber();
                }
            }
            return false;
        }
    });
    b3.setOnTouchListener(new View.OnTouchListener() {
        public boolean onTouch(View v, MotionEvent e) {
            if (e.getAction() == android.view.MotionEvent.ACTION_UP) {
                if (3 == random) {
                    playerscore++;
                    runOnUiThread(new Runnable() {
                        public void run() {
                            score.setText("Your Score Is " + playerscore);
                        }
                    });
                    randomnumber();
                }
                if (3 != random) {
                    playerscore--;
                    runOnUiThread(new Runnable() {
                        public void run() {
                            score.setText("Your Score Is " + playerscore);
                        }
                    });
                    randomnumber();
                }
            }
            return false;
        }
    });
    b4.setOnTouchListener(new View.OnTouchListener() {
        public boolean onTouch(View v, MotionEvent e) {
            if (e.getAction() == android.view.MotionEvent.ACTION_UP) {
                if (4 == random) {
                    playerscore++;
                    runOnUiThread(new Runnable() {
                        public void run() {
                            score.setText("Your Score Is " + playerscore);
                        }
                    });
                    randomnumber();
                }
                if (4 != random) {
                    playerscore--;
                    runOnUiThread(new Runnable() {
                        public void run() {
                            score.setText("Your Score Is " + playerscore);
                        }
                    });
                    randomnumber();
                }
            }
            return false;
        }
    });
    b5.setOnTouchListener(new View.OnTouchListener() {
        public boolean onTouch(View v, MotionEvent e) {
            if (e.getAction() == android.view.MotionEvent.ACTION_UP) {
                if (5 == random) {
                    playerscore++;
                    runOnUiThread(new Runnable() {
                        public void run() {
                            score.setText("Your Score Is " + playerscore);
                        }
                    });
                    randomnumber();
                }
                if (5 != random) {
                    playerscore--;
                    runOnUiThread(new Runnable() {
                        public void run() {
                            score.setText("Your Score Is " + playerscore);
                        }
                    });
                    randomnumber();
                }
            }
            return false;
        }
    });
    b6.setOnTouchListener(new View.OnTouchListener() {
        public boolean onTouch(View v, MotionEvent e) {
            if (e.getAction() == android.view.MotionEvent.ACTION_UP) {
                if (6 == random) {
                    playerscore++;
                    runOnUiThread(new Runnable() {
                        public void run() {
                            score.setText("Your Score Is " + playerscore);
                        }
                    });
                    randomnumber();
                }
                if (6 != random) {
                    playerscore--;
                    runOnUiThread(new Runnable() {
                        public void run() {
                            score.setText("Your Score Is " + playerscore);
                        }
                    });
                    randomnumber();
                }
            }
            return false;
        }
    });
    b7.setOnTouchListener(new View.OnTouchListener() {
        public boolean onTouch(View v, MotionEvent e) {
            if (e.getAction() == android.view.MotionEvent.ACTION_UP) {
                if (7 == random) {
                    playerscore++;
                    runOnUiThread(new Runnable() {
                        public void run() {
                            score.setText("Your Score Is " + playerscore);
                        }
                    });
                    randomnumber();
                }
                if (7 != random) {
                    playerscore--;
                    runOnUiThread(new Runnable() {
                        public void run() {
                            score.setText("Your Score Is " + playerscore);
                        }
                    });
                    randomnumber();
                }
            }
            return false;
        }
    });
    b8.setOnTouchListener(new View.OnTouchListener() {
        public boolean onTouch(View v, MotionEvent e) {
            if (e.getAction() == android.view.MotionEvent.ACTION_UP) {
                if (8 == random) {
                    playerscore++;
                    runOnUiThread(new Runnable() {
                        public void run() {
                            score.setText("Your Score Is " + playerscore);
                        }
                    });
                    randomnumber();
                }
                if (8 != random) {
                    playerscore--;
                    runOnUiThread(new Runnable() {
                        public void run() {
                            score.setText("Your Score Is " + playerscore);
                        }
                    });
                    randomnumber();
                }
            }
            return false;
        }
    });
    b9.setOnTouchListener(new View.OnTouchListener() {
        public boolean onTouch(View v, MotionEvent e) {
            if (e.getAction() == android.view.MotionEvent.ACTION_UP) {
                if (9 == random) {
                    playerscore++;
                    runOnUiThread(new Runnable() {
                        public void run() {
                            score.setText("Your Score Is " + playerscore);
                        }
                    });
                    randomnumber();
                }
                if (9 != random) {
                    playerscore--;
                    runOnUiThread(new Runnable() {
                        public void run() {
                            score.setText("Your Score Is " + playerscore);
                        }
                    });
                    randomnumber();
                }
            }
            return false;
        }
    });
    b0.setOnTouchListener(new View.OnTouchListener() {
        public boolean onTouch(View v, MotionEvent e) {
            if (e.getAction() == android.view.MotionEvent.ACTION_UP) {
                if (0 == random) {
                    playerscore++;
                    runOnUiThread(new Runnable() {
                        public void run() {
                            score.setText("Your Score Is " + playerscore);
                        }
                    });
                    randomnumber();
                }
                if (0 != random) {
                    playerscore--;
                    runOnUiThread(new Runnable() {
                        public void run() {
                            score.setText("Your Score Is " + playerscore);
                        }
                    });
                    randomnumber();
                }
            }
            return false;
        }
    });
    startTimer();
}
public void startTimer() {
    Timer t = new Timer("Game Timer");
    handler = new Handler();
    t.scheduleAtFixedRate(new TimerTask() {
        @Override
        public void run() {
            if (time > 0) {
                time -= 1;
                runOnUiThread(new Runnable() {
                    public void run() {
                        try {
                            timer.setText("Seconds Remaining: "+ time);
                        } catch (Exception e) {
                        }
                    }
                });
            }
            if (time <= 0) {
                this.cancel();
                  finish();
            }
        }
    },
    // time before start of timer
            0,
            // time before it runs again
            1000);
}
public void randomnumber() {
    r = new Random();
    random = r.nextInt(10);
    runOnUiThread(new Runnable() {
        public void run() {
            showingnumber.setText(String.valueOf(random));
        }
    });
}
}

这是我的XML:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
    android:id="@+id/game_timer"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:text="Seconds Remaining: 0.0"
    android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="@+id/game_score"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:gravity="center"
android:text="Your Score Is 0"
android:textAppearance="?android:attr/textAppearanceLarge" />
<Button
    android:id="@+id/b1.4"
    android:layout_width="80dp"
    android:layout_height="50dp"
    android:layout_alignLeft="@+id/b1.1"
    android:layout_alignTop="@+id/b1.1"
    android:layout_marginTop="73dp"
    android:text="4" />
<TextView
    android:id="@+id/game_number"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@+id/game_timer"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="89dp"
    android:gravity="center"
    android:text="0"
    android:textAppearance="?android:attr/textAppearanceMedium" />
<Button
    android:id="@+id/b1.1"
    android:layout_width="80dp"
    android:layout_height="50dp"
    android:layout_alignParentLeft="true"
    android:layout_below="@+id/game_number"
    android:layout_marginLeft="14dp"
    android:layout_marginTop="130dp"
    android:text="1" />
<Button
    android:id="@+id/b1.7"
    android:layout_width="80dp"
    android:layout_height="50dp"
    android:layout_above="@+id/game_score"
    android:layout_alignLeft="@+id/b1.4"
    android:layout_marginBottom="15dp"
    android:text="7" />
<Button
    android:id="@+id/b1.2"
    android:layout_width="80dp"
    android:layout_height="50dp"
    android:layout_alignBaseline="@+id/b1.1"
    android:layout_alignBottom="@+id/b1.1"
    android:layout_centerHorizontal="true"
    android:text="2" />
<Button
    android:id="@+id/b1.5"
    android:layout_width="80dp"
    android:layout_height="50dp"
    android:layout_alignBaseline="@+id/b1.4"
    android:layout_alignBottom="@+id/b1.4"
    android:layout_centerHorizontal="true"
    android:text="5" />
<Button
    android:id="@+id/b1.8"
    android:layout_width="80dp"
    android:layout_height="50dp"
    android:layout_alignBaseline="@+id/b1.7"
    android:layout_alignBottom="@+id/b1.7"
    android:layout_centerHorizontal="true"
    android:text="8" />
<Button
    android:id="@+id/b1.0"
    android:layout_width="80dp"
    android:layout_height="50dp"
    android:layout_above="@+id/b1.2"
    android:layout_alignLeft="@+id/b1.2"
    android:layout_marginBottom="18dp"
    android:text="0" />
<Button
    android:id="@+id/b1.6"
    android:layout_width="80dp"
    android:layout_height="50dp"
    android:layout_alignBaseline="@+id/b1.4"
    android:layout_alignBottom="@+id/b1.4"
    android:layout_alignParentRight="true"
    android:layout_marginRight="20dp"
    android:text="6" />
<Button
    android:id="@+id/b1.9"
    android:layout_width="80dp"
    android:layout_height="50dp"
    android:layout_alignBaseline="@+id/b1.7"
    android:layout_alignBottom="@+id/b1.7"
    android:layout_alignLeft="@+id/b1.6"
    android:text="9" />
<Button
    android:id="@+id/b1.3"
    android:layout_width="80dp"
    android:layout_height="50dp"
    android:layout_alignBaseline="@+id/b1.1"
    android:layout_alignBottom="@+id/b1.1"
    android:layout_alignLeft="@+id/b1.6"
    android:text="3" />
</RelativeLayout>

Answer 1

您的布局为game_timer，您的代码为game_timer2。

检查一下。你的台词是:

timer = (TextView) findViewById(R.id.game_timer2);
finalscore = (TextView) findViewById(R.id.finalscore);

game_timer2和finalscore在你的布局中不存在

你应该使用Handler来编辑你的GUI。为例。在你的课堂上添加这个

 static final int SCORE_UP = 1;     static final int SCORE_DOWN = 2;
     final Handler mhandler = new Handler() { 
                  int playerscore = 0;
          @Override
          public void handleMessage(Message msg) {
              switch(msg.what ){
              case SCORE_UP:
              {
                  playerscore++;
              }
                  break;
              case SCORE_DOWN:
              {
                  playerscore--;
              }
                  break;
                  default:
              }
              score.setText("Your Score Is " + playerscore);
             }
   };

在你积极使用的地方

runOnUiThread(new Runnable() {
   public void run() {
     mhandler.sendMessage(Message.obtain(mhandler, SCORE_UP));
     //score.setText("Your Score Is " + playerscore);
   }
});