Question

以下是故事：

我正在尝试在Android Studio中构建一个猜谜游戏。用户必须猜测0到1000之间的数字。每次用户猜测时，计算机都会告诉您猜测是否小于实际数字（冷）或大于实际数字（热门）。我决定让用户在editTextView中输入他的猜测。我将onFocus事件监听器绑定到editTextView，以便当用户按下Enter或点击其他位置时，它会将猜测提交给计算机。我在模拟器中运行了代码，并从控制台收到一些消息，说明类似于以下内容：

W/ViewRootImpl: Cancelling event due to no window focus: MotionEvent { action=ACTION_CANCEL, actionButton=0, id[0]=0, x[0]=605.52246, y[0]=969.4336, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=238238, downTime=235422, deviceId=0, source=0x1002 }

public class GameActivity extends AppCompatActivity implements View.OnFocusChangeListener {
    public final int MAXNUMBER = 1000;
    private int theAnswer; // stores the number the user has to guess
    public int guesses = 0;
    public EditText userGuess;
    public TextView hotOrCold;
    public String isHotOrCold(int userInput){
        return theAnswer < userInput?"Hot":"Cold"; // Utility to tell the user if his guess is greater than or less than the number.
    }
    public boolean isValidInput(int num){
        return num >= 0 && num <= MAXNUMBER;
    }
    public void resetGame(){
        guesses = 0;
        theAnswer = (int) (Math.random() * (MAXNUMBER + 1));
    }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_game);

        userGuess = (EditText)findViewById(R.id.userGuess);
        hotOrCold = (TextView) findViewById(R.id.hotOrCold);
        resetGame();
        userGuess.setOnFocusChangeListener(this);
    }

    @Override
    public void onFocusChange(View v, boolean hasFocus) {
        /* When focus is lost check that the text field
        * has valid values.
        */
        Log.i("","RAN!");
        if (!hasFocus) {
            guesses++;
            int userInput = Integer.valueOf(userGuess.getText().toString()); // get user input
            Log.i("userInput is: ",userInput+"");
            if (isValidInput(userInput)){
                if (theAnswer == userInput){
                    Toast.makeText(getApplicationContext(),"Congrats! The number was: "+userInput+". You got it in " + guesses + " guesses!",Toast.LENGTH_LONG); // Tell user he got it right
                    hotOrCold.setText("Hot Or Cold"); // set text to default
                    resetGame();
                } else {
                    hotOrCold.setText(isHotOrCold(userInput)); // Tells user if he is hot or cold.
                }
            } else {
                // do nothing
            }
        } else {
            Log.i("Did Run","");
        }
    }
}

这是产生消息的代码。如果您需要更多信息或希望我详细说明，请告诉我们！

假设ID正确，并且活动中存在程序中的所有视图。似乎只要用户按Enter键或更改焦点，函数onFocusChange就不会运行。

编辑：当我在edittext元素上打开focusable属性时，我出现了一个新错误。这是错误：

W/ResourceType: Failure getting entry for 0x01080346 (t=7 e=838) (error -75)
    [ 07-13 12:54:05.572  2725: 2725 I/         ]
    RAN!

只在程序开始时发生ONCE

以下代码提供代码链接的活动。

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.alexander.guessinggame.GameActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Hot or Cold"
        android:id="@+id/hotOrCold"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:textIsSelectable="false"
        android:textSize="50sp" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceSmall"
        android:text="*Hot:too big, cold:too small"
        android:id="@+id/textView3"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:textIsSelectable="false"
        android:textSize="17sp" />

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="number"
        android:ems="10"
        android:id="@+id/userGuess"
        android:layout_above="@+id/textView3"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="111dp"
        android:numeric="integer"
        android:selectAllOnFocus="true"
        android:editable="true"
        android:focusableInTouchMode="true"
        android:focusable="true"
        android:enabled="true"
        android:singleLine="true"
        android:clickable="true"
        android:maxLength="4" />

</RelativeLayout>

如果您需要什么，请不要犹豫，问我！

有谁能告诉我以下错误是什么意思？当我点击edittext框时它们会出来。

W/EGL_emulation: eglSurfaceAttrib not implemented
W/OpenGLRenderer: Failed to set EGL_SWAP_BEHAVIOR on surface 0xa9fc6300, error=EGL_SUCCESS
E/Surface: getSlotFromBufferLocked: unknown buffer: 0xae3f3fb0

Answer 1

您可以覆盖：

onKeyUp(int keyCode, KeyEvent event)

Answer 2

请按照以下步骤操作，让我知道它是否有效

覆盖要检查是否为Tab或按下Enter的dispatchKeyEvent。
如果按下Tab或Enter键，并且EditTextView具有焦点，请提交猜测。

如果您有任何疑问或需要代码段，请告诉我。

由于没有窗口焦点而取消事件：MotionEvent

2 个答案: