samples/TicTacToeLib/src/com/example/android/tictactoe/library/GameActivity.java - platform/development - Git at Google

 /*
  * Copyright (C) 2010 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 package com.example.android.tictactoe.library;

 import java.util.Random;

 import android.app.Activity;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Message;
 import android.os.Handler.Callback;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;
 import android.widget.TextView;

 import com.example.android.tictactoe.library.GameView.ICellListener;
 import com.example.android.tictactoe.library.GameView.State;


 public class GameActivity extends Activity {

     /** Start player. Must be 1 or 2. Default is 1. */
     public static final String EXTRA_START_PLAYER =
         "com.example.android.tictactoe.library.GameActivity.EXTRA_START_PLAYER";

     private static final int MSG_COMPUTER_TURN = 1;
     private static final long COMPUTER_DELAY_MS = 500;

     private Handler mHandler = new Handler(new MyHandlerCallback());
     private Random mRnd = new Random();
     private GameView mGameView;
     private TextView mInfoView;
     private Button mButtonNext;

     /** Called when the activity is first created. */
     @Override
     public void onCreate(Bundle bundle) {
         super.onCreate(bundle);

         /*
          * IMPORTANT: all resource IDs from this library will eventually be merged
          * with the resources from the main project that will use the library.
          *
          * If the main project and the libraries define the same resource IDs,
          * the application project will always have priority and override library resources
          * and IDs defined in multiple libraries are resolved based on the libraries priority
          * defined in the main project.
          *
          * An intentional consequence is that the main project can override some resources
          * from the library.
          * (TODO insert example).
          *
          * To avoid potential conflicts, it is suggested to add a prefix to the
          * library resource names.
          */
         setContentView(R.layout.lib_game);

         mGameView = (GameView) findViewById(R.id.game_view);
         mInfoView = (TextView) findViewById(R.id.info_turn);
         mButtonNext = (Button) findViewById(R.id.next_turn);

         mGameView.setFocusable(true);
         mGameView.setFocusableInTouchMode(true);
         mGameView.setCellListener(new MyCellListener());

         mButtonNext.setOnClickListener(new MyButtonListener());
     }

     @Override
     protected void onResume() {
         super.onResume();

         State player = mGameView.getCurrentPlayer();
         if (player == State.UNKNOWN) {
             player = State.fromInt(getIntent().getIntExtra(EXTRA_START_PLAYER, 1));
             if (!checkGameFinished(player)) {
                 selectTurn(player);
             }
         }
         if (player == State.PLAYER2) {
             mHandler.sendEmptyMessageDelayed(MSG_COMPUTER_TURN, COMPUTER_DELAY_MS);
         }
         if (player == State.WIN) {
             setWinState(mGameView.getWinner());
         }
     }


     private State selectTurn(State player) {
         mGameView.setCurrentPlayer(player);
         mButtonNext.setEnabled(false);

         if (player == State.PLAYER1) {
             mInfoView.setText(R.string.player1_turn);
             mGameView.setEnabled(true);

         } else if (player == State.PLAYER2) {
             mInfoView.setText(R.string.player2_turn);
             mGameView.setEnabled(false);
         }

         return player;
     }

     private class MyCellListener implements ICellListener {
         public void onCellSelected() {
             if (mGameView.getCurrentPlayer() == State.PLAYER1) {
                 int cell = mGameView.getSelection();
                 mButtonNext.setEnabled(cell >= 0);
             }
         }
     }

     private class MyButtonListener implements OnClickListener {

         public void onClick(View v) {
             State player = mGameView.getCurrentPlayer();

             if (player == State.WIN) {
                 GameActivity.this.finish();

             } else if (player == State.PLAYER1) {
                 int cell = mGameView.getSelection();
                 if (cell >= 0) {
                     mGameView.stopBlink();
                     mGameView.setCell(cell, player);
                     finishTurn();
                 }
             }
         }
     }

     private class MyHandlerCallback implements Callback {
         public boolean handleMessage(Message msg) {
             if (msg.what == MSG_COMPUTER_TURN) {

                 // Pick a non-used cell at random. That's about all the AI you need for this game.
                 State[] data = mGameView.getData();
                 int used = 0;
                 while (used != 0x1F) {
                     int index = mRnd.nextInt(9);
                     if (((used >> index) & 1) == 0) {
                         used |= 1 << index;
                         if (data[index] == State.EMPTY) {
                             mGameView.setCell(index, mGameView.getCurrentPlayer());
                             break;
                         }
                     }
                 }

                 finishTurn();
                 return true;
             }
             return false;
         }
     }

     private State getOtherPlayer(State player) {
         return player == State.PLAYER1 ? State.PLAYER2 : State.PLAYER1;
     }

     private void finishTurn() {
         State player = mGameView.getCurrentPlayer();
         if (!checkGameFinished(player)) {
             player = selectTurn(getOtherPlayer(player));
             if (player == State.PLAYER2) {
                 mHandler.sendEmptyMessageDelayed(MSG_COMPUTER_TURN, COMPUTER_DELAY_MS);
             }
         }
     }

     public boolean checkGameFinished(State player) {
         State[] data = mGameView.getData();
         boolean full = true;

         int col = -1;
         int row = -1;
         int diag = -1;

         // check rows
         for (int j = 0, k = 0; j < 3; j++, k += 3) {
             if (data[k] != State.EMPTY && data[k] == data[k+1] && data[k] == data[k+2]) {
                 row = j;
             }
             if (full && (data[k] == State.EMPTY ||
                          data[k+1] == State.EMPTY ||
                          data[k+2] == State.EMPTY)) {
                 full = false;
             }
         }

         // check columns
         for (int i = 0; i < 3; i++) {
             if (data[i] != State.EMPTY && data[i] == data[i+3] && data[i] == data[i+6]) {
                 col = i;
             }
         }

         // check diagonals
         if (data[0] != State.EMPTY && data[0] == data[1+3] && data[0] == data[2+6]) {
             diag = 0;
         } else  if (data[2] != State.EMPTY && data[2] == data[1+3] && data[2] == data[0+6]) {
             diag = 1;
         }

         if (col != -1 || row != -1 || diag != -1) {
             setFinished(player, col, row, diag);
             return true;
         }

         // if we get here, there's no winner but the board is full.
         if (full) {
             setFinished(State.EMPTY, -1, -1, -1);
             return true;
         }
         return false;
     }

     private void setFinished(State player, int col, int row, int diagonal) {

         mGameView.setCurrentPlayer(State.WIN);
         mGameView.setWinner(player);
         mGameView.setEnabled(false);
         mGameView.setFinished(col, row, diagonal);

         setWinState(player);
     }

     private void setWinState(State player) {
         mButtonNext.setEnabled(true);
         mButtonNext.setText("Back");

         String text;

         if (player == State.EMPTY) {
             text = getString(R.string.tie);
         } else if (player == State.PLAYER1) {
             text = getString(R.string.player1_win);
         } else {
             text = getString(R.string.player2_win);
         }
         mInfoView.setText(text);
     }
 }
	/*
	* Copyright (C) 2010 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	package com.example.android.tictactoe.library;

	import java.util.Random;

	import android.app.Activity;
	import android.os.Bundle;
	import android.os.Handler;
	import android.os.Message;
	import android.os.Handler.Callback;
	import android.view.View;
	import android.view.View.OnClickListener;
	import android.widget.Button;
	import android.widget.TextView;

	import com.example.android.tictactoe.library.GameView.ICellListener;
	import com.example.android.tictactoe.library.GameView.State;


	public class GameActivity extends Activity {

	/** Start player. Must be 1 or 2. Default is 1. */
	public static final String EXTRA_START_PLAYER =
	"com.example.android.tictactoe.library.GameActivity.EXTRA_START_PLAYER";

	private static final int MSG_COMPUTER_TURN = 1;
	private static final long COMPUTER_DELAY_MS = 500;

	private Handler mHandler = new Handler(new MyHandlerCallback());
	private Random mRnd = new Random();
	private GameView mGameView;
	private TextView mInfoView;
	private Button mButtonNext;

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle bundle) {
	super.onCreate(bundle);

	/*
	* IMPORTANT: all resource IDs from this library will eventually be merged
	* with the resources from the main project that will use the library.
	*
	* If the main project and the libraries define the same resource IDs,
	* the application project will always have priority and override library resources
	* and IDs defined in multiple libraries are resolved based on the libraries priority
	* defined in the main project.
	*
	* An intentional consequence is that the main project can override some resources
	* from the library.
	* (TODO insert example).
	*
	* To avoid potential conflicts, it is suggested to add a prefix to the
	* library resource names.
	*/
	setContentView(R.layout.lib_game);

	mGameView = (GameView) findViewById(R.id.game_view);
	mInfoView = (TextView) findViewById(R.id.info_turn);
	mButtonNext = (Button) findViewById(R.id.next_turn);

	mGameView.setFocusable(true);
	mGameView.setFocusableInTouchMode(true);
	mGameView.setCellListener(new MyCellListener());

	mButtonNext.setOnClickListener(new MyButtonListener());
	}

	@Override
	protected void onResume() {
	super.onResume();

	State player = mGameView.getCurrentPlayer();
	if (player == State.UNKNOWN) {
	player = State.fromInt(getIntent().getIntExtra(EXTRA_START_PLAYER, 1));
	if (!checkGameFinished(player)) {
	selectTurn(player);
	}
	}
	if (player == State.PLAYER2) {
	mHandler.sendEmptyMessageDelayed(MSG_COMPUTER_TURN, COMPUTER_DELAY_MS);
	}
	if (player == State.WIN) {
	setWinState(mGameView.getWinner());
	}
	}


	private State selectTurn(State player) {
	mGameView.setCurrentPlayer(player);
	mButtonNext.setEnabled(false);

	if (player == State.PLAYER1) {
	mInfoView.setText(R.string.player1_turn);
	mGameView.setEnabled(true);

	} else if (player == State.PLAYER2) {
	mInfoView.setText(R.string.player2_turn);
	mGameView.setEnabled(false);
	}

	return player;
	}

	private class MyCellListener implements ICellListener {
	public void onCellSelected() {
	if (mGameView.getCurrentPlayer() == State.PLAYER1) {
	int cell = mGameView.getSelection();
	mButtonNext.setEnabled(cell >= 0);
	}
	}
	}

	private class MyButtonListener implements OnClickListener {

	public void onClick(View v) {
	State player = mGameView.getCurrentPlayer();

	if (player == State.WIN) {
	GameActivity.this.finish();

	} else if (player == State.PLAYER1) {
	int cell = mGameView.getSelection();
	if (cell >= 0) {
	mGameView.stopBlink();
	mGameView.setCell(cell, player);
	finishTurn();
	}
	}
	}
	}

	private class MyHandlerCallback implements Callback {
	public boolean handleMessage(Message msg) {
	if (msg.what == MSG_COMPUTER_TURN) {

	// Pick a non-used cell at random. That's about all the AI you need for this game.
	State[] data = mGameView.getData();
	int used = 0;
	while (used != 0x1F) {
	int index = mRnd.nextInt(9);
	if (((used >> index) & 1) == 0) {
	used \|= 1 << index;
	if (data[index] == State.EMPTY) {
	mGameView.setCell(index, mGameView.getCurrentPlayer());
	break;
	}
	}
	}

	finishTurn();
	return true;
	}
	return false;
	}
	}

	private State getOtherPlayer(State player) {
	return player == State.PLAYER1 ? State.PLAYER2 : State.PLAYER1;
	}

	private void finishTurn() {
	State player = mGameView.getCurrentPlayer();
	if (!checkGameFinished(player)) {
	player = selectTurn(getOtherPlayer(player));
	if (player == State.PLAYER2) {
	mHandler.sendEmptyMessageDelayed(MSG_COMPUTER_TURN, COMPUTER_DELAY_MS);
	}
	}
	}

	public boolean checkGameFinished(State player) {
	State[] data = mGameView.getData();
	boolean full = true;

	int col = -1;
	int row = -1;
	int diag = -1;

	// check rows
	for (int j = 0, k = 0; j < 3; j++, k += 3) {
	if (data[k] != State.EMPTY && data[k] == data[k+1] && data[k] == data[k+2]) {
	row = j;
	}
	if (full && (data[k] == State.EMPTY \|\|
	data[k+1] == State.EMPTY \|\|
	data[k+2] == State.EMPTY)) {
	full = false;
	}
	}

	// check columns
	for (int i = 0; i < 3; i++) {
	if (data[i] != State.EMPTY && data[i] == data[i+3] && data[i] == data[i+6]) {
	col = i;
	}
	}

	// check diagonals
	if (data[0] != State.EMPTY && data[0] == data[1+3] && data[0] == data[2+6]) {
	diag = 0;
	} else if (data[2] != State.EMPTY && data[2] == data[1+3] && data[2] == data[0+6]) {
	diag = 1;
	}

	if (col != -1 \|\| row != -1 \|\| diag != -1) {
	setFinished(player, col, row, diag);
	return true;
	}

	// if we get here, there's no winner but the board is full.
	if (full) {
	setFinished(State.EMPTY, -1, -1, -1);
	return true;
	}
	return false;
	}

	private void setFinished(State player, int col, int row, int diagonal) {

	mGameView.setCurrentPlayer(State.WIN);
	mGameView.setWinner(player);
	mGameView.setEnabled(false);
	mGameView.setFinished(col, row, diagonal);

	setWinState(player);
	}

	private void setWinState(State player) {
	mButtonNext.setEnabled(true);
	mButtonNext.setText("Back");

	String text;

	if (player == State.EMPTY) {
	text = getString(R.string.tie);
	} else if (player == State.PLAYER1) {
	text = getString(R.string.player1_win);
	} else {
	text = getString(R.string.player2_win);
	}
	mInfoView.setText(text);
	}
	}