write an android app that displays a chessboard on a grid with black and white
pieces. You can represent each piece by a letter or two, for example, P for pawn,
Q for queen, R for rook, K for knight, B for bishop, and KG for king. When the
user clicks on a knight, color in green the cells where the knight can move. Include
a Model. Do not use XML, that is, the view should be constructed by means of
objects of layout classes.
package com.src.android_chess; import java.util.ArrayList; import java.util.NoSuchElementException; import android.app.Activity; import android.app.AlertDialog; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.graphics.Color; import android.os.Bundle; import android.view.Display; import android.view.Menu; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.LinearLayout; import android.widget.LinearLayout.LayoutParams; import android.widget.TableLayout; import android.widget.TableRow; import android.widget.Toast; import com.src.game.Game; import com.src.grid.Chessboard; import com.src.grid.Location; import com.src.move.IllegalMoveException; import com.src.pieces.Piece; public class PlayChess extends Activity { private Square[][] squares = new Square[8][8]; private Square selected; private Location selectedLocation; private Game game; private LinearLayout linearLayout; private TableLayout table; private TableRow tr; private Display mDisplay; private int displayHeight, displayWidth; private Button ai, undo, resign, draw; @Override protected void onCreate(Bundle savedInstanceState) { // TODO reverting to sideways view calls onCreate and restarts super.onCreate(savedInstanceState); mDisplay = this.getWindowManager().getDefaultDisplay(); displayHeight = mDisplay.getHeight(); setContentView(R.layout.chessboard); generateBoard(); game = new Game(new Chessboard()); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.gamemenu, menu); return true; } /** * Renders the entire board to the screen. */ private void renderBoard() { Chessboard board = game.getGrid(); for (int rank = 7; rank >= 0; rank--) { for (int file = 0; file < 8; file++) { Square s = squares[rank][file]; Location loc = new Location(rank, file); if (board.isOccupied(loc)) { Piece p = board.get(loc); if (p.getAlgebraicName().equalsIgnoreCase(\"P\")) { s.setImageResource(p.isWhite() ? R.drawable.whitepawn : R.drawable.blackpawn); } else if (p.getAlgebraicName().equalsIgnoreCase(\"KG\")) { s.setImageResource(p.isWhite() ? R.drawable.whiteking : R.drawable.blackking); } else if (p.getAlgebraicName().equalsIgnoreCase(\"Q\")) { s.setImageResource(p.isWhite() ? R.drawable.whitequeen : R.drawable.blackqueen); } else if (p.getAlgebraicName().equalsIgnoreCase(\"R\")) { s.setImageResource(p.isWhite() ? R.drawable.whiterook : R.drawable.blackrook); } else if (p.getAlgebraicName().equalsIgnoreCase(\"K\")) { s.setImageResource(p.isWhite() ? R.drawable.whiteknight : R.drawable.blackknight); } else if (p.getAlgebraicName().equalsIgnoreCase(\"B\")) { s.setImageResource(p.isWhite() ? R.drawable.whitebishop : R.drawable.blackbishop); } else System.out.println(\"Found an unknown piece\"); } else s.setImageResource(R.drawable.transparent); } } } /** * Generates the board and adds click listeners to each view. */ private void generateBoard() { linearLayout = (LinearLayout) this.findViewById(R.id.chessboard); linearLayout.removeAllViews(); linearLayout.invalidate(); linearLayout.refreshDrawableState(); table = new TableLayout(this); table.removeAllViews(); table.invalidate(); table.refreshDrawableState(); linearLayout.addView(table); table.setLayoutParams(new TableLayout.LayoutParams( LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT)); table.setStretchAllColumns(true); table.setOrientation(LinearLayout.VERTICAL); ai = new Button(this); undo = new Button(this); resign = new Button(this); draw = new Button(this); linearLayout.addView(ai); linearLayout.addView(undo); linearLayout.addView(resign); linearLayout.addView(draw); ai.setText(\"AI\"); ai.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { ai(); } }); undo.setText(\"Undo\"); undo.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { undo(); } }); resign.setText(\"Resign\"); resign.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub resign(); } }); draw.setText(\"Draw\"); draw.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { draw(); } }); setupBoard(); // this is 1-8 for (int r = 7; r >= 0; r--) { tr = new TableRow(this); tr.removeAllViews(); tr.invalidate(); tr.refreshDrawableState(); table.addView(tr); tr.setLayoutParams(new TableLayout.LayoutParams( LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); // this is a-h for (int c = 0; c < 8; c++) { // TextView im = new TextView(this); final int x = r, y = c; Square im = squares[r][c]; im.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (selected != null) { if (squares[x][y] == selected) { squares[x][y].setBackgroundColor(squares[x][y] .isWhite() ? Color.WHITE : Color.GRAY); selected = null; return; } else { Location src = selectedLocation; Location dest = new Location(x, y); try { boolean inCheck = game.move(src, dest); if (inCheck) Toast.makeText(getBaseContext(), \"Check!\", Toast.LENGTH_LONG) .show(); // squares[dest.getRank()][dest.getFile()].removePiece(); // squares[dest.getRank()][dest.getFile()].addPiece(squares[x][y].getPiece()); // squares[src.getRank()][src.getFile()].removePiece(); // switchImage(squares[dest.getRank()][dest.getFile()]); // switchImage(squares[src.getRank()][src.getFile()]); renderBoard(); } catch (IllegalMoveException e) { StringBuilder sb = new StringBuilder(); sb.append(e.getPiece() + \" cannot move to \" + e.getLocation() + \".\"); sb.append(\'\ \'); ArrayList
locs = e.getPiece() .getMoves(); if (locs.isEmpty()) sb.append(\"This piece has no available moves.\"); else { sb.append(e.getPiece() + \" can move to: \"); for (Location loc : e.getPiece() .getMoves()) { sb.append(loc); sb.append(\' \'); } } Toast.makeText(getBaseContext(), sb.toString(), Toast.LENGTH_LONG) .show(); return; } finally { selected.setBackgroundColor(selected .isWhite() ? Color.WHITE : Color.GRAY); selected = null; selectedLocation = null; } } } else { Location loc = new Location(x, y); if (game.getGrid().get(loc) == null) { return; } Piece p = game.getGrid().get(loc); if (p.isWhite() != game.isWhitesTurn()) { Toast.makeText( getBaseContext(), \"You can only move your own pieces.\ It\'s \" + (game.isWhitesTurn() ? \"white\'s\" : \"black\'s\") + \" turn.\", Toast.LENGTH_SHORT).show(); return; } // select this piece squares[x][y].toggleSelected(); // Globals.getInstance().toggleSelected(squares[x][y]); selected = squares[x][y]; selectedLocation = new Location(x, y); squares[x][y].setBackgroundColor(Color.RED); } } }); // ImageButton im = new ImageButton(this); // black back row if (r == 7) { // rook if (c == 0 || c == 7) { im.setImageResource(R.drawable.blackrook); } // knight else if (c == 1 || c == 6) { im.setImageResource(R.drawable.blackknight); } // bishop else if (c == 2 || c == 5) { im.setImageResource(R.drawable.blackbishop); } // queen else if (c == 3) { im.setImageResource(R.drawable.blackqueen); } // king else if (c == 4) { im.setImageResource(R.drawable.blackking); } else { im.setImageResource(R.drawable.ic_launcher); } } // black pawns else if (r == 6) { im.setImageResource(R.drawable.blackpawn); } // white pawns else if (r == 1) { im.setImageResource(R.drawable.whitepawn); } // white back row else if (r == 0) { // rook if (c == 0 || c == 7) { im.setImageResource(R.drawable.whiterook); } // knight else if (c == 1 || c == 6) { im.setImageResource(R.drawable.whiteknight); } // bishop else if (c == 2 || c == 5) { im.setImageResource(R.drawable.whitebishop); } // queen else if (c == 3) { im.setImageResource(R.drawable.whitequeen); } // king else if (c == 4) { im.setImageResource(R.drawable.whiteking); } else { im.setImageResource(R.drawable.ic_launcher); } } else { im.setImageResource(R.drawable.transparent); } // im.setPadding(0, 0, 0, 0); //padding in each image if needed im.setAdjustViewBounds(true); // Grabbing the width im.setMinimumHeight(displayHeight / 8); im.setMinimumWidth(20); im.setMaxHeight(displayHeight / 8); im.setMaxWidth(20); if (squares[r][c].isWhite()) { im.setBackgroundColor(Color.WHITE); } else { im.setBackgroundColor(Color.GRAY); } im.setLayoutParams(new TableRow.LayoutParams( TableRow.LayoutParams.WRAP_CONTENT, TableRow.LayoutParams.WRAP_CONTENT)); // add here on click event etc for each image... // ... // tr.addView(im, im.getWidth(),im.getHeight()); tr.addView(im); } } setContentView(linearLayout); return; } private void setupBoard() { for (int x = 7; x >= 0; x--) { for (int y = 0; y < 8; y++) { final int r = x; final int c = y; String location; location = \"\" + ((char) (c + 97)) + \"\" + (r + 1); squares[r][c] = new Square(this, (((r + c) % 2) != 0) ? true : false, location); } } } @Deprecated private void switchImage(Square im) { Location loc = new Location(im.getLocation()); Globals.getInstance().toaster(getApplicationContext(), \"location:\" + loc); if (game.getGrid().isOccupied(loc)) { Piece p = game.getGrid().get(loc); String type = p.getAlgebraicName(); Globals.getInstance().toaster(getApplicationContext(), \"type: \" + type); if (type.equals(\"\")) { im.setImageResource(p.isWhite() ? R.drawable.whitepawn : R.drawable.blackpawn); } else if (type.equals(\"N\")) { im.setImageResource(p.isWhite() ? R.drawable.whiteknight : R.drawable.blackknight); } else if (type.equals(\"B\")) { im.setImageResource(p.isWhite() ? R.drawable.whitebishop : R.drawable.blackbishop); } else if (type.equals(\"R\")) { im.setImageResource(p.isWhite() ? R.drawable.whiterook : R.drawable.blackrook); } else if (type.equals(\"Q\")) { im.setImageResource(p.isWhite() ? R.drawable.whitequeen : R.drawable.blackqueen); } else if (type.equals(\"K\")) { im.setImageResource(p.isWhite() ? R.drawable.whiteking : R.drawable.blackking); } } else { im.setImageResource(R.drawable.transparent); } im.setAdjustViewBounds(true); im.setMinimumHeight(displayHeight / 10); im.setMinimumWidth(20); im.setMaxHeight(displayHeight / 10); im.setMaxWidth(20); if (im.isWhite()) { im.setBackgroundColor(Color.WHITE); } else { im.setBackgroundColor(Color.GRAY); } } /* * private void renderBoard() { // linearLayout = (LinearLayout) * this.findViewById(R.id.chessboard); linearLayout.removeView(table); * linearLayout.removeAllViews(); linearLayout.invalidate(); * linearLayout.refreshDrawableState(); TableLayout newTable = new * TableLayout(this); newTable.removeAllViews(); * linearLayout.addView(newTable); newTable.setLayoutParams(new * TableLayout.LayoutParams(LayoutParams.FILL_PARENT, * LayoutParams.WRAP_CONTENT)); newTable.setStretchAllColumns(true); * newTable.setOrientation(LinearLayout.VERTICAL); for(int rank = 7; rank >= * 0; rank--) { tr.removeAllViews(); TableRow newTR = new TableRow(this); * newTable.addView(newTR); newTR.setLayoutParams(new * TableLayout.LayoutParams( LayoutParams.WRAP_CONTENT, * LayoutParams.WRAP_CONTENT)); Square[][] temp = new Square[8][8]; for(int * file = 0; file < 8; file++) { Location loc = new Location(rank, file); * temp[rank][file] = squares[rank][file]; * if(game.getGrid().isOccupied(loc)) { Piece p = game.getGrid().get(loc); * String type = p.getAlgebraicName(); if(type.equals(\"\")) { * temp[rank][file].setImageResource(p.isWhite() ? R.drawable.whitepawn : * R.drawable.blackpawn); } else if(type.equals(\"N\")) { * temp[rank][file].setImageResource(p.isWhite() ? R.drawable.whiteknight : * R.drawable.blackknight); } else if(type.equals(\"B\")) { * temp[rank][file].setImageResource(p.isWhite() ? R.drawable.whitebishop : * R.drawable.blackbishop); } else if(type.equals(\"R\")) { * temp[rank][file].setImageResource(p.isWhite() ? R.drawable.whiterook : * R.drawable.blackrook); } else if(type.equals(\"Q\")) { * temp[rank][file].setImageResource(p.isWhite() ? R.drawable.whitequeen : * R.drawable.blackqueen); } else if(type.equals(\"K\")) { * temp[rank][file].setImageResource(p.isWhite() ? R.drawable.whiteking : * R.drawable.blackking); } } else { * temp[rank][file].setImageResource(R.drawable.transparent); } * temp[rank][file].setAdjustViewBounds(true); * temp[rank][file].setMinimumHeight(displayHeight/10); * temp[rank][file].setMinimumWidth(20); * temp[rank][file].setMaxHeight(displayHeight / 10); * temp[rank][file].setMaxWidth(20); if (squares[rank][file].isWhite()){ * temp[rank][file].setBackgroundColor(Color.WHITE); } else { * temp[rank][file].setBackgroundColor(Color.GRAY); } * temp[rank][file].setLayoutParams(new TableRow.LayoutParams( * TableRow.LayoutParams.WRAP_CONTENT, TableRow.LayoutParams.WRAP_CONTENT)); * // newTR.removeAllViews(); // newTR.invalidate(); // * newTR.refreshDrawableState(); View parent = ((View) * temp[rank][file].getParent()); newTR.removeView(temp[rank][file]); * newTR.addView(temp[rank][file]); //** end here *** } } } // */ /** * Offers a draw. */ public void draw() { // TODO Dialog yes/no box boolean white = game.isWhitesTurn(); final Context temp = this; new AlertDialog.Builder(this) .setIcon(android.R.drawable.ic_dialog_alert) .setTitle(\"Draw!\") .setMessage(\"Are you sure this game is a draw?\") .setPositiveButton(\"Yes\", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Globals.getInstance().setDraw(); saveGame(); Intent intent = new Intent(temp, Outcome.class); startActivity(intent); } }).setNegativeButton(\"No\", null).show(); // TODO new view to report result } /** * Attempts to make a move on behalf of the current player. */ public void ai() { try { game.makeAutomaticMove(); renderBoard(); } catch (NoSuchElementException e) { Toast.makeText(this, \"The computer has no moves for you.\", Toast.LENGTH_SHORT).show(); } } /** * Resigns from the game. */ public void resign() { final boolean white = game.isWhitesTurn(); final Context temp = this; new AlertDialog.Builder(this) .setIcon(android.R.drawable.ic_dialog_alert) .setTitle(\"Resign\") .setMessage( \"Are you sure you want to resign? \" + (white ? \"Black\" : \"White\") + \" will win.\") .setPositiveButton(\"Yes\", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { if (white) { Globals.getInstance().setBlackWinner(); } else { Globals.getInstance().setWhiteWinner(); } saveGame(); // Intent intent = new Intent(temp, Outcome.class); // startActivity(intent); } }).setNegativeButton(\"No\", null).show(); // TODO new view to report result } private void saveGame() { AlertDialog.Builder alert = new AlertDialog.Builder(this); alert.setTitle(\"Save Game\"); alert.setMessage(\"Enter a title for this saved game, or hit \'Cancel\' to abort.\"); // Set an EditText view to get user input final EditText input = new EditText(this); alert.setView(input); alert.setPositiveButton(\"Ok\", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { char[] charseq = new char[input.getText().length()]; input.getText().getChars(0, input.getText().length(), charseq, 0); String str = new String(charseq); Globals.getSavedGames().add(game.toPlayback(str)); } }); alert.setNegativeButton(\"Cancel\", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { // Canceled. } }); alert.show(); } /** * Takes back the last move, if possible. */ public void undo() { if (game.canUndo()) { game.undo(); Toast.makeText( this, \"Last move taken back. It\'s \" + (game.isWhitesTurn() ? \"white\'s\" : \"black\'s\") + \" turn.\", Toast.LENGTH_SHORT).show(); } else Toast.makeText(this, \"You cannot take back any more moves.\", Toast.LENGTH_SHORT).show(); renderBoard(); } public void playGame(View view) { System.out.println(\"Play game!\"); } @Override public void onBackPressed() { new AlertDialog.Builder(this) .setIcon(android.R.drawable.ic_dialog_alert) .setTitle(\"Closing Activity\") .setMessage( \"Are you sure you want to quit this game? The game will not be saved.\") .setPositiveButton(\"Yes\", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { finish(); } }).setNegativeButton(\"No\", null).show(); } }
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