Question

在我添加了一些代码行后，我的应用程序在单击按钮后崩溃了。我不明白为什么。该应用程序的目的是尽可能快地双击，它显示从第一次点击到第二次点击所需的时间（以毫秒为单位）。我尝试在右上角添加一个高分。但是在我添加int highScoreInt = (int) (startTime - millisUntilFinished);和int currentScoreInt = (int) (startTime - millisUntilFinished);以将这些计时器值存储为此if语句的整数之后

if (currentScoreInt >= highScoreInt) {
            highScore.setText(highScoreInt);
        }

我的应用崩溃了。

这是XML`

xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#000000"
tools:context="com.keklabs.reactiontimer.MainActivity">


<TextView
    android:id="@+id/currentScore"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_above="@+id/startStopButton"
    android:layout_centerHorizontal="true"
    android:layout_marginBottom="99dp"
    android:text="Click below to start!"
    android:textColor="#39FF14"
    android:textSize="30dp" />

<Button
    android:id="@+id/startStopButton"
    android:layout_width="match_parent"
    android:layout_height="250dp"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
    android:background="#000000"
    android:text="Start / Stop"
    android:textSize="25dp"
    android:textColor="#39FF14" />

<TextView
    android:id="@+id/bestText"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_marginEnd="18dp"
    android:layout_marginTop="23dp"
    android:layout_toStartOf="@+id/highScore"
    android:text="Best:"
    android:textColor="#39FF14"
    android:textSize="20dp"
    android:textStyle="bold" />

<TextView
    android:id="@+id/highScore"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignBottom="@+id/bestText"
    android:layout_alignParentEnd="true"
    android:layout_marginEnd="14dp"
    android:textStyle="bold"
    android:textSize="20dp"
    android:textColor="#39FF14"
    android:text="---" />

`

这是Java

public class MainActivity extends AppCompatActivity {

private final long startTime = 30000;
private final long interval = 100;
private boolean buttonClicked;
private Button startStopButton;
private TextView currentScore;
private int highScoreInt;
private TextView highScore;
private TextView bestText;

CountDownTimer timer = new CountDownTimer(startTime, interval) {

    @Override
    public void onTick(long millisUntilFinished) {
        currentScore.setText("" + (startTime - millisUntilFinished));
        highScore.setText("" + (startTime - millisUntilFinished));

        int highScoreInt = (int) (startTime - millisUntilFinished);
        int currentScoreInt = (int) (startTime - millisUntilFinished);

        if (currentScoreInt >= highScoreInt) {
            highScore.setText(highScoreInt);
        }
    }

    @Override
    public void onFinish() {
    }
};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    currentScore = (TextView) findViewById(R.id.currentScore);
    highScore = (TextView) findViewById(R.id.highScore);
    bestText = (TextView) findViewById(R.id.bestText);
    startStopButton = (Button) findViewById(R.id.startStopButton);


    startStopButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (!buttonClicked) {
                timer.start();
                buttonClicked = true;
            }
            else {
                timer.cancel();
                buttonClicked = false;
            }
        }
    });
}

}

here's the logcat screenshot

谢谢！

Answer 1

在

if (currentScoreInt >= highScoreInt) {
        highScore.setText(highScoreInt);
}

请使用highScore.setText(String.valueOf(highScoreInt));

添加一些代码后，应用程序崩溃了

1 个答案: