在我开始之前,我试着看看其他类似的问题,但我不知道为什么xml告诉我gameview不存在。我知道我做错了什么,但我不知道是什么。
我在XML中有一些按钮和文本视图,我希望能够在我的活动中使用它们,其中contentView设置为gameView。这可行吗?
在我的xml中,我有四个按钮,它们都有一个onClick属性,它们发送(颜色),RGB或黄色。根据用户点击的内容,我希望将答案设置为不同的整数。如果他们的答案正确,我希望通过generateWWORD方法弹出新的颜色。然而,在我的xml中,我得到了错误
“找不到以下类:-com.example.ali.colormatch2.surfaceview.Gameview,
即使我有一个GameView类。
我的xml文件activity_color_match.xml:
<?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:id="@+id/activity_color_match"
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.ali.colormatch2.ColorMatch2">
<com.exmple.ali.colormatch2.surfaceview.GameView
android:id="@+id/gameView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<TextView
android:text="@string/mainColor"
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:textColor="@android:color/background_dark"
android:textSize="100dp"
android:layout_marginBottom="104dp"
android:textAppearance="@style/TextAppearance.AppCompat.Display3"
android:layout_above="@+id/button3"
android:layout_centerHorizontal="true" />
<Button
android:layout_width="150dp"
android:layout_height="60dp"
android:id="@+id/button"
android:background="#000080"
android:onClick="sendBlue"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<Button
android:layout_height="60dp"
android:id="@+id/button2"
android:background="#ffff00"
android:elevation="0dp"
android:layout_width="150dp"
android:onClick="sendYellow"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
<Button
android:layout_width="150dp"
android:layout_height="60dp"
android:id="@+id/button3"
android:background="@android:color/holo_red_dark"
android:onClick="sendRed"
android:layout_above="@+id/button"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginBottom="19dp" />
<Button
android:layout_width="150dp"
android:layout_height="60dp"
android:id="@+id/button4"
android:background="@android:color/holo_green_dark"
android:onClick="sendGreen"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_alignBottom="@+id/button3" />
<TextView
android:text="Score:"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:id="@+id/textView4" />
<TextView
android:text="@string/matchText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/textView3"
android:textAppearance="@style/TextAppearance.AppCompat.Body2"
android:textSize="25dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
</RelativeLayout>
package com.example.ali.colormatch2;
import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.widget.RelativeLayout;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.ImageView;
import android.widget.TextView;
import java.util.Random;
public class ColorMatch2 extends Activity {
// gameView will be the view of the game
// It will also hold the logic of the game
// and respond to screen touches as well
GameView gameView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Initialize gameView and set it as the view
gameView = new GameView(this);
setContentView(gameView);
TextView textView3, textView2, textView4;
textView3 = (TextView) findViewById(R.id.textView3);
textView2 = (TextView) findViewById(R.id.textView2);
textView4 = (TextView) findViewById(R.id.textView4);
}
// GameView class will go here
// Here is our implementation of GameView
// It is an inner class.
// Note how the final closing curly brace }
// Notice we implement runnable so we have
// A thread and can override the run method.
class GameView extends SurfaceView implements Runnable {
// This is our thread
Thread gameThread = null;
// This is new. We need a SurfaceHolder
// When we use Paint and Canvas in a thread
// We will see it in action in the draw method soon.
SurfaceHolder ourHolder;
// A boolean which we will set and unset
// when the game is running- or not.
volatile boolean playing;
// A Canvas and a Paint object
Canvas canvas;
Paint paint;
// This variable tracks the game frame rate
long fps;
// This is used to help calculate the fps
private long timeThisFrame;
//My variables
int answer;
int correctAnswer;
int score = 0;
int randomInt2, randomInt1;
int count = 0;
boolean matchColor = true, matchText = false, firstTime = true;
// When the we initialize (call new()) on gameView
public GameView(Context context) {
// The next line of code asks the
// SurfaceView class to set up our object.
// How kind.,
super(context);
// Initialize ourHolder and paint objects
ourHolder = getHolder();
paint = new Paint();
// Set our boolean to true - game on!
playing = true;
}
@Override
public void run() {
while (playing) {
// Capture the current time in milliseconds in startFrameTime
long startFrameTime = System.currentTimeMillis();
// Update the frame
update();
// Draw the frame
draw();
// Calculate the fps this frame
// We can then use the result to
// time animations and more.
timeThisFrame = System.currentTimeMillis() - startFrameTime;
if (timeThisFrame > 0) {
fps = 1000 / timeThisFrame;
}
}
}
public void update() {
if (firstTime) {
generateNewWord();
firstTime = false;
}
if (answer == correctAnswer) {
score++;
count++;
generateNewWord();
}
//else {
// quit();
// }
if (count % 5 == 0) {
if (matchColor) {
textView3.setText(getString(R.string.gameSetting2)); // might need to add context with this - check http://stackoverflow.com/questions/10698945/reference-string-resource-from-code
matchText = true;
matchColor = false;
} else if (matchText) {
textView3.setText(getString(R.string.gameSetting1));
matchColor = true;
matchText = false;
}
}
}
public void generateNewWord() {
//randomly select between red, green, blue, yellow
Random rand = new Random();
randomInt1 = rand.nextInt(4) + 1; // assigns randomInt a value between 1 - 4
randomInt2 = rand.nextInt(4) + 1;
if (randomInt1 ==1){
textView2.setText(R.string.Red);
}
else if (randomInt1 ==2){
textView2.setText(R.string.Green);
}
else if (randomInt1 == 3){
textView2.setText(R.string.Blue);
}
else if (randomInt1 == 4){
textView2.setText(R.string.Yellow);
}
//randomly select hex codes between rgby
if (randomInt2 ==1){
textView2.setTextColor(0xffcc0000);
}
else if (randomInt2 ==2){
textView2.setTextColor(0xff669900);
}
else if (randomInt2 == 3){
textView2.setTextColor(0xff000080);
}
else if (randomInt2 == 4){
textView2.setTextColor(0xffffff00);
}
if (matchColor) {
correctAnswer = randomInt2;
}
else if(matchText){
correctAnswer = randomInt1;
}
}
// Draw the newly updated scene
public void draw() {
// Make sure our drawing surface is valid or we crash
if (ourHolder.getSurface().isValid()) {
// Lock the canvas ready to draw
canvas = ourHolder.lockCanvas();
// Draw the background color
canvas.drawColor(Color.argb(255, 255, 255, 255));
// Make the text a bit bigger
paint.setTextSize(30);
// Display the current score on the screen
canvas.drawText("Score:" + score, 20, 40, paint);
// Draw everything to the screen
ourHolder.unlockCanvasAndPost(canvas);
}
}
// If SimpleGameEngine Activity is paused/stopped
// shutdown our thread.
public void pause() {
playing = false;
try {
gameThread.join();
} catch (InterruptedException e) {
Log.e("Error:", "joining thread");
}
}
// If SimpleGameEngine Activity is started then
// start our thread.
public void resume() {
playing = true;
gameThread = new Thread(this);
gameThread.start();
}
/*public void sendBlue(View view){
answer = 2;
}
public void sendRed(View view){
answer = 1;
}
public void sendYellow(View view){
answer = 4;
}
public void sendGreen(View view){
answer = 3;
}*/
//@Override
public int getAnswer(MotionEvent motionEvent) {
public void sendBlue(View view){
answer = 2;
}
public void sendRed(View view){
answer = 1;
}
public void sendYellow(View view){
answer = 4;
}
public void sendGreen(View view){
answer = 3;
}
return answer;
}
}
// This is the end of our GameView inner class
// More SimpleGameEngine methods will go here
// This method executes when the player starts the game
@Override
protected void onResume() {
super.onResume();
// Tell the gameView resume method to execute
gameView.resume();
}
// This method executes when the player quits the game
@Override
protected void onPause() {
super.onPause();
// Tell the gameView pause method to execute
gameView.pause();
}
}
我还想指出,我可能可以通过如下方式使用setTextView,但这并不能解决使用xml文件中的按钮的问题:
public void draw() {
// Make sure our drawing surface is valid or we crash
if (ourHolder.getSurface().isValid()) {
// Lock the canvas ready to draw
canvas = ourHolder.lockCanvas();
// Draw the background color
canvas.drawColor(Color.argb(255, 255, 255, 255));
// Make the text a bit bigger
paint.setTextSize(30);
// Display the current score on the screen
canvas.drawText("Score:" + score, 20, 40, paint);
if (randomInt2 ==1){
paint.setColor(Color.argb(255, 255, 0, 0)); }
else if (randomInt2 ==2){
paint.setColor(Color.argb(255, 0, 191, 255)); }
else if (randomInt2 == 3){
paint.setColor(Color.argb(255, 0, 128, 0)); }
else if (randomInt2 == 4){
paint.setColor(Color.argb(255, 255, 255, 0)); }
paint.setTextSize(60);
if (randomInt1 ==1){
canvas.drawText("Red" , 100, 100, paint);
}
else if (randomInt1 ==2){
canvas.drawText("Green" , 100, 100, paint);
}
else if (randomInt1 == 3){
canvas.drawText("Blue" , 100, 100, paint);
}
else if (randomInt1 == 4){
canvas.drawText("Yellow" , 100, 100, paint);
}
// Draw everything to the screen
ourHolder.unlockCanvasAndPost(canvas);
}
}
这是我的字符串文件:
<resources>
<string name="app_name">ColorMatch</string>
<string name="gameSetting1">Match the COLOR</string>
<string name="gameSetting2">Match the TEXT</string>
<string name="Red">Red</string>
<string name="Green">Green </string>
<string name="Blue">Blue</string>
<string name="Yellow">Yellow</string>
<string name="matchText">Test</string>
<string name="mainColor">Test</string>
<string name="score">Score:</string>
</resources>
编辑:感谢Nongthonbam Tonthoi,我找到了如何修复XML错误的方法。然而,在我现在为按钮代码单独的公共GameView类中,它表示这些方法从未使用过。我需要添加什么来修复这个问题,并确保当用户单击按钮时,它正确地更改了int-answer的值?
按钮的代码。除了将它们从getAnswer方法中移除之外,我的GameView类的其余部分是相同的:
public void sendBlue(View view){
answer = 2;
}
public void sendRed(View view){
answer = 1;
}
public void sendYellow(View view){
answer = 4;
}
public void sendGreen(View view){
answer = 3;
}
