我正在 Build 一个战舰Android游戏，我很难弄清楚为什么onTouchtEvent无法识别手指移动 .
有什么建议？
package com.example.omer.battleship;
import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.view.*;
import android.widget.*;
import java.util.*;
public class Game extends AppCompatActivity {
public static GameCell[][] gameGrid ;
View gameBoard = null;
public static boolean gameStarted = false;
Spinner shipSpinner;
String[] shipsArray;
Map<String, Integer> shipsMap = new HashMap<String, Integer>();
private boolean ture;
private int dimention;
// ArrayAdapter<String> spinnerArrayAdapter;
public Game(Context context,int dimention) {
super();
this.dimention=dimention;
initializeApp(dimention);
gameBoard= findViewById(R.id.boardView);
gameBoard.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent event) {
int eventAction=event.getAction();
switch (eventAction)
{
case MotionEvent.ACTION_DOWN:
break;
case MotionEvent.ACTION_UP:
break;
case MotionEvent.ACTION_MOVE:
break;
}
return true;
}
});
}
private void initializeApp(int dimention) {
// Initialize the gameGrid
gameGrid= new GameCell[dimention][dimention];
for (int y = 0; y < dimention; y++) {
for (int x = 0; x < dimention; x++) {
gameGrid[x][y] = new GameCell();
}
}
gameGrid[1][1].setHas_ship(true); // For debugging
gameGrid[1][2].setHit(true);
}
这是董事会视图类
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Point;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
public class BoardView extends View {
int border = 10; // Width of the outer border
int topBoardX = border;
int topBoardY = 50;
int fontSize = 30;
private int dimention;
Point[][] grid = new Point[11][11];
String[] letters = {"A", "B", "C", "D", "E", "F", "G", "H", "I", "J","K","L","M","N","O"};
String[] numbers = {" 1", " 2", " 3", " 4", " 5", " 6", " 7", " 8", " 9", "10"," 11"," 12"," 13"," 14"," 15"};
//private static Paint paint;
Point origin = new Point(this.getLeft(), this.getTop());
Paint paint = new Paint();
public BoardView(Context context,int dimention) {
super(context);
this.dimention=dimention;
Log.println(Log.ASSERT,"DIMENTION", String.valueOf(dimention));
init(null);
}
public BoardView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
// paint = new Paint();
paint.setStrokeWidth(10);
paint.setColor(Color.BLACK);
paint.setStyle(Paint.Style.STROKE);
paint.setTextSize(fontSize);
}
public BoardView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(attrs);
}
public BoardView(Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
init(attrs);
}
private void init(@Nullable AttributeSet set) {
}
@Override
protected void onDraw(Canvas canvas) {
Game game = new Game(this.getContext(),this.dimention);
super.onDraw(canvas);
int screenHeight = this.getMeasuredHeight();
int screenWidth = this.getMeasuredWidth();
int middle = screenHeight / 2;
canvas.drawRect(topBoardX, topBoardY, screenWidth - border, middle - border, paint);
paint.setColor(Color.LTGRAY);
// Calculate cell width based on width
int cellWidth = (screenWidth / dimention) - 1;
int cellHeight = (middle - border) / 12; // 10 cells + 1 for letters and 1 for Attack/Defend Boards
// Draw a border
canvas.drawRect(topBoardX, topBoardY, screenWidth - border, middle - border, paint);
paint.setColor(Color.BLACK);
paint.setStrokeWidth(3);
Game.gameGrid[0][0].setCellHeight(cellHeight);
Game.gameGrid[0][0].setCellWidth(cellWidth);
Game.gameGrid[0][0].setViewOrigin(origin);
for (int y = 0; y < dimention; y++) {
for (int x = 0; x < dimention; x++) { // TODO: add the points to the gameGrid
Game.gameGrid[x][y].setTopleft(new Point(x * cellWidth + border, y * cellHeight + topBoardY));
Game.gameGrid[x][y].setBottomright(new Point((x + 1) * cellWidth + border, (y + 1) * cellHeight + topBoardX));
}
}
// Draw the horizontal lines
for (int i = 0; i < dimention; i++) {
canvas.drawLine(i * cellWidth + border, topBoardY, i * cellWidth + border, middle - border, paint); // Vertical Lines
canvas.drawLine(border, i * cellHeight + topBoardY, screenWidth - border, i * cellHeight + topBoardY, paint); // Horizontal Lines
}
//---------------------
paint.setStrokeWidth(2);
paint.setColor(Color.WHITE);
paint.setStyle(Paint.Style.FILL_AND_STROKE);
canvas.drawText("Attacking Board", 40, 40, paint);
float w = paint.measureText(numbers[0], 0, numbers[0].length());
float center = (cellWidth / 2) - (w / 2);
/*drawing the first colum and Row */
for (int x = 0; x < dimention-1; x++) {
canvas.drawText(letters[x], Game.gameGrid[x][0].getTopleft().x + center + cellWidth, Game.gameGrid[x][0].getTopleft().y + fontSize + border, paint);
}
for (int y = 0; y < dimention-1; y++) {
canvas.drawText(numbers[y], Game.gameGrid[0][y].getTopleft().x + center, Game.gameGrid[0][y + 1].getTopleft().y + cellHeight - border, paint);
}
paint.setColor(Color.WHITE);
// Draw the contents of the grid
for (int y = 0; y < dimention; y++) {
for (int x = 0; x < dimention; x++) {
if (Game.gameGrid[x][y].getHas_ship())
drawCell("S", x, y, center, canvas);
if (Game.gameGrid[x][y].getWaiting())
drawCell("W", x, y, center, canvas);
if (Game.gameGrid[x][y].getMiss())
drawCell("M", x, y, center, canvas);
if (Game.gameGrid[x][y].getHit())
drawCell("H", x, y, center, canvas);
}
}
}
void drawCell( String contents, int x, int y, float center, Canvas canvas ) {
canvas.drawText( contents, Game.gameGrid[x][y].getTopleft().x + center, Game.gameGrid[x][y].getTopleft().y + center, paint );
}
}
这就像当我触摸一个细胞时，它需要去触摸它并且什么都不做 . 有人能帮我解决问题吗？
这是错误日志
memtrack: Couldn't load memtrack module (No such file or directory)
2018-12-10 12:51:40.764 4616-4616/? E/android.os.Debug: failed to load memtrack module: -2
2018-12-10 12:51:41.241 4635-4635/? E/memtrack: Couldn't load memtrack module (No such file or directory)
2018-12-10 12:51:41.241 4635-4635/? E/android.os.Debug: failed to load memtrack module: -2
2018-12-10 12:51:44.956 4649-4649/? E/memtrack: Couldn't load memtrack module (No such file or directory)
2018-12-10 12:51:44.956 4649-4649/? E/android.os.Debug: failed to load memtrack module: -2
2018-12-10 12:51:45.010 4647-4647/? E/memtrack: Couldn't load memtrack module (No such file or directory)
2018-12-10 12:51:45.010 4647-4647/? E/android.os.Debug: failed to load memtrack module: -2
2018-12-10 12:51:45.297 4670-4670/? E/memtrack: Couldn't load memtrack module (No such file or directory)
2018-12-10 12:51:45.297 4670-4670/? E/android.os.Debug: failed to load memtrack module: -2
2018-12-10 12:51:46.141 1317-1332/? E/SurfaceFlinger: ro.sf.lcd_density must be defined as a build property
2018-12-10 12:51:50.130 4679-4679/com.example.omer.battleship A/DIMENTION: 8
2018-12-10 12:51:50.244 4679-4679/com.example.omer.battleship E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.omer.battleship, PID: 4679
java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.Window$Callback android.view.Window.getCallback()' on a null object reference
at android.support.v7.app.AppCompatDelegateImplBase.<init>(AppCompatDelegateImplBase.java:117)
at android.support.v7.app.AppCompatDelegateImplV9.<init>(AppCompatDelegateImplV9.java:149)
at android.support.v7.app.AppCompatDelegateImplV14.<init>(AppCompatDelegateImplV14.java:56)
at android.support.v7.app.AppCompatDelegateImplV23.<init>(AppCompatDelegateImplV23.java:31)
at android.support.v7.app.AppCompatDelegateImplN.<init>(AppCompatDelegateImplN.java:31)
at android.support.v7.app.AppCompatDelegate.create(AppCompatDelegate.java:198)
at android.support.v7.app.AppCompatDelegate.create(AppCompatDelegate.java:183)
at android.support.v7.app.AppCompatActivity.getDelegate(AppCompatActivity.java:519)
at android.support.v7.app.AppCompatActivity.findViewById(AppCompatActivity.java:190)
at com.example.omer.battleship.Game.<init>(Game.java:30)
at com.example.omer.battleship.BoardView.onDraw(BoardView.java:64)
at android.view.View.draw(View.java:17071)
at android.view.View.updateDisplayListIfDirty(View.java:16053)
at android.view.View.draw(View.java:16837)
at android.view.ViewGroup.drawChild(ViewGroup.java:3764)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3550)
at android.view.View.updateDisplayListIfDirty(View.java:16048)
at android.view.View.draw(View.java:16837)
at android.view.ViewGroup.drawChild(ViewGroup.java:3764)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3550)
at android.view.View.updateDisplayListIfDirty(View.java:16048)
at android.view.View.draw(View.java:16837)
at android.view.ViewGroup.drawChild(ViewGroup.java:3764)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3550)
at android.view.View.updateDisplayListIfDirty(View.java:16048)
at android.view.View.draw(View.java:16837)
at android.view.ViewGroup.drawChild(ViewGroup.java:3764)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3550)
at android.view.View.updateDisplayListIfDirty(View.java:16048)
at android.view.View.draw(View.java:16837)
at android.view.ViewGroup.drawChild(ViewGroup.java:3764)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3550)
at android.view.View.draw(View.java:17074)
at com.android.internal.policy.DecorView.draw(DecorView.java:751)
at android.view.View.updateDisplayListIfDirty(View.java:16053)
at android.view.ThreadedRenderer.updateViewTreeDisplayList(ThreadedRenderer.java:656)
at android.view.ThreadedRenderer.updateRootDisplayList(ThreadedRenderer.java:662)
at android.view.ThreadedRenderer.draw(ThreadedRenderer.java:770)
at android.view.ViewRootImpl.draw(ViewRootImpl.java:2796)
at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2604)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2211)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1246)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6301)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:871)
at android.view.Choreographer.doCallbacks(Choreographer.java:683)
at android.view.Choreographer.doFrame(Choreographer.java:619)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:857)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756)
1 回答
您没有为任何单元格设置TouchListener . 虽然您确实编写了onTouchEvent方法，但它并没有附加到要侦听的任何内容上 .
I.E.