android+studio中shape

在Android Studio中，shape是一种XML文件，用于定义可绘制的形状。它可以用于定义按钮、文本框、背景等的形状和样式。通过使用shape，可以轻松地创建自定义的UI元素，而无需使用图像文件。在shape中，可以定义颜色、边框、圆角、渐变等属性。可以通过在XML布局文件中引用shape来应用它们。在Android开发中，shape是非常常用的一种技术。

相关问题

android+studio中shape的radius

在Android Studio中，shape是一种用于定义View的外观的XML文件。radius属性用于设置View的圆角半径。通过设置radius属性，可以使View的边角变得圆滑。

radius属性可以在shape标签中使用，具体的使用方式如下所示：

<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <corners android:radius="10dp" />
    <!-- 其他属性 -->
</shape>

在上述代码中，`<corners>`标签用于设置圆角的半径，`android:radius`属性用于指定圆角的大小，单位为dp（设备独立像素）。在这个例子中，圆角的半径被设置为10dp。

你也可以分别为每个角指定不同的半径，例如：

<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <corners
        android:topLeftRadius="10dp"
        android:topRightRadius="20dp"
        android:bottomLeftRadius="30dp"
        android:bottomRightRadius="40dp" />
    <!-- 其他属性 -->
</shape>

这样就可以为每个角指定不同的圆角半径。

android+studio俄罗斯方块

Android Studio是一款非常流行的Android应用程序开发工具，可以用于开发各种类型的应用程序，包括游戏。俄罗斯方块是一种非常受欢迎的游戏，可以在Android Studio中使用Java编写。以下是实现俄罗斯方块游戏的一些步骤：

1. 创建一个新的Android Studio项目，并设置项目名称和包名。
2. 在项目中创建一个新的Activity，并将其设置为主Activity。
3. 在布局文件中添加一个SurfaceView，用于绘制游戏界面。
4. 创建一个Game类，用于处理游戏逻辑和绘制游戏界面。
5. 在Game类中实现游戏逻辑，包括方块的移动、旋转和消除等。
6. 在Game类中实现绘制游戏界面的方法，包括绘制背景墙、方块和控制面板等。
7. 在MainActivity中创建一个Game对象，并将其与SurfaceView关联。
8. 在MainActivity中实现游戏控制逻辑，包括处理用户输入和更新游戏状态等。

下面是一个简单的示例代码，用于实现俄罗斯方块游戏：

public class Game {
    private int[][] board;
    private Block currentBlock;
    private int score;

    public Game() {
        board = new int[10][20];
        currentBlock = new Block();
        score = 0;
    }

    public void update() {
        if (currentBlock.canMoveDown(board)) {
            currentBlock.moveDown();
        } else {
            currentBlock.addToBoard(board);
            int lines = clearLines();
            score += lines * 100;
            currentBlock = new Block();
        }
    }

    public void moveLeft() {
        if (currentBlock.canMoveLeft(board)) {
            currentBlock.moveLeft();
        }
    }

    public void moveRight() {
        if (currentBlock.canMoveRight(board)) {
            currentBlock.moveRight();
        }
    }

    public void rotate() {
        if (currentBlock.canRotate(board)) {
            currentBlock.rotate();
        }
    }

    public int getScore() {
        return score;
    }

    public int[][] getBoard() {
        return board;
    }

    private int clearLines() {
        int lines = 0;
        for (int i = 0; i < board[0].length; i++) {
            boolean full = true;
            for (int j = 0; j < board.length; j++) {
                if (board[j][i] == 0) {
                    full = false;
                    break;
                }
            }
            if (full) {
                lines++;
                for (int j = 0; j < board.length; j++) {
                    for (int k = i; k > 0; k--) {
                        board[j][k] = board[j][k - 1];
                    }
                    board[j][0] = 0;
                }
            }
        }
        return lines;
    }
}

public class Block {
    private int[][] shape;
    private int x;
    private int y;

    public Block() {
        Random random = new Random();
        int type = random.nextInt(7);
        switch (type) {
            case 0:
                shape = new int[][]{{1, 1}, {1, 1}};
                break;
            case 1:
                shape = new int[][]{{0, 1, 0}, {1, 1, 1}};
                break;
            case 2:
                shape = new int[][]{{0, 1, 1}, {1, 1, 0}};
                break;
            case 3:
                shape = new int[][]{{1, 1, 0}, {0, 1, 1}};
                break;
            case 4:
                shape = new int[][]{{1, 0, 0}, {1, 1, 1}};
                break;
            case 5:
                shape = new int[][]{{0, 0, 1}, {1, 1, 1}};
                break;
            case 6:
                shape = new int[][]{{1, 1, 1, 1}};
                break;
        }
        x = 4;
        y = 0;
    }

    public boolean canMoveDown(int[][] board) {
        for (int i = 0; i < shape.length; i++) {
            for (int j = 0; j < shape[i].length; j++) {
                if (shape[i][j] != 0) {
                    int row = y + i + 1;
                    int col = x + j;
                    if (row >= board[0].length || board[col][row] != 0) {
                        return false;
                    }
                }
            }
        }
        return true;
    }

    public void moveDown() {
        y++;
    }

    public boolean canMoveLeft(int[][] board) {
        for (int i = 0; i < shape.length; i++) {
            for (int j = 0; j < shape[i].length; j++) {
                if (shape[i][j] != 0) {
                    int row = y + i;
                    int col = x + j - 1;
                    if (col < 0 || board[col][row] != 0) {
                        return false;
                    }
                }
            }
        }
        return true;
    }

    public void moveLeft() {
        x--;
    }

    public boolean canMoveRight(int[][] board) {
        for (int i = 0; i < shape.length; i++) {
            for (int j = 0; j < shape[i].length; j++) {
                if (shape[i][j] != 0) {
                    int row = y + i;
                    int col = x + j + 1;
                    if (col >= board.length || board[col][row] != 0) {
                        return false;
                    }
                }
            }
        }
        return true;
    }

    public void moveRight() {
        x++;
    }

    public boolean canRotate(int[][] board) {
        int[][] newShape = new int[shape[0].length][shape.length];
        for (int i = 0; i < shape.length; i++) {
            for (int j = 0; j < shape[i].length; j++) {
                newShape[j][shape.length - 1 - i] = shape[i][j];
            }
        }
        for (int i = 0; i < newShape.length; i++) {
            for (int j = 0; j < newShape[i].length; j++) {
                if (newShape[i][j] != 0) {
                    int row = y + i;
                    int col = x + j;
                    if (row < 0 || row >= board[0].length || col < 0 || col >= board.length || board[col][row] != 0) {
                        return false;
                    }
                }
            }
        }
        shape = newShape;
        return true;
    }

    public void rotate() {
        int[][] newShape = new int[shape[0].length][shape.length];
        for (int i = 0; i < shape.length; i++) {
            for (int j = 0; j < shape[i].length; j++) {
                newShape[j][shape.length - 1 - i] = shape[i][j];
            }
        }
        shape = newShape;
    }

    public void addToBoard(int[][] board) {
        for (int i = 0; i < shape.length; i++) {
            for (int j = 0; j < shape[i].length; j++) {
                if (shape[i][j] != 0) {
                    board[x + j][y + i] = shape[i][j];
                }
            }
        }
    }

    public int[][] getShape() {
        return shape;
    }

    public int getX() {
        return x;
    }

    public int getY() {
        return y;
    }
}

public class GameView extends SurfaceView implements SurfaceHolder.Callback {
    private GameThread thread;
    private Game game;

    public GameView(Context context, AttributeSet attrs) {
        super(context, attrs);
        getHolder().addCallback(this);
        thread = new GameThread(getHolder(), this);
        setFocusable(true);
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        game = new Game();
        thread.setRunning(true);
        thread.start();
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        boolean retry = true;
        while (retry) {
            try {
                thread.setRunning(false);
                thread.join();
                retry = false;
            } catch (InterruptedException e) {
            }
        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_DOWN) {
            float x = event.getX();
            float y = event.getY();
            if (x < getWidth() / 2) {
                game.moveLeft();
            } else {
                game.moveRight();
            }
        }
        return true;
    }

    public void update() {
        game.update();
    }

    @Override
    public void draw(Canvas canvas) {
        super.draw(canvas);
        if (canvas != null) {
            int[][] board = game.getBoard();
            int blockSize = getWidth() / 10;
            Paint paint = new Paint();
            paint.setStyle(Paint.Style.FILL);
            for (int i = 0; i < board.length; i++) {
                for (int j = 0; j < board[i].length; j++) {
                    if (board[i][j] != 0) {
                        paint.setColor(getColor(board[i][j]));
                        canvas.drawRect(i * blockSize, j * blockSize, (i + 1) * blockSize, (j + 1) * blockSize, paint);
                    }
                }
            }
            Block currentBlock = game.getCurrentBlock();
            int[][] shape = currentBlock.getShape();
            int x = currentBlock.getX();
            int y = currentBlock.getY();
            for (int i = 0; i < shape.length; i++) {
                for (int j = 0; j < shape[i].length; j++) {
                    if (shape[i][j] != 0) {
                        paint.setColor(getColor(shape[i][j]));
                        canvas.drawRect((x + j) * blockSize, (y + i) * blockSize, (x + j + 1) * blockSize, (y + i + 1) * blockSize, paint);
                    }
                }
            }
        }
    }

    private int getColor(int value) {
        switch (value) {
            case 1:
                return Color.RED;
            case 2:
                return Color.GREEN;
            case 3:
                return Color.BLUE;
            case 4:
                return Color.YELLOW;
            case 5:
                return Color.CYAN;
            case 6:
                return Color.MAGENTA;
            case 7:
                return Color.GRAY;
            default:
                return Color.WHITE;
        }
    }
}

public class GameThread extends Thread {
    private SurfaceHolder surfaceHolder;
    private GameView gameView;
    private boolean running;

    public GameThread(SurfaceHolder surfaceHolder, GameView gameView) {
        this.surfaceHolder = surfaceHolder;
        this.gameView = gameView;
    }

    public void setRunning(boolean running) {
        this.running = running;
    }

    @Override
    public void run() {
        while (running) {
            Canvas canvas = null;
            try {
                canvas = surfaceHolder.lockCanvas();
                synchronized (surfaceHolder) {
                    gameView.update();
                    gameView.draw(canvas);
                }
            } finally {
                if (canvas != null) {
                    surfaceHolder.unlockCanvasAndPost(canvas);
                }
            }
        }
    }
}

MainActivity中的代码：

public class MainActivity extends AppCompatActivity {
    private GameView gameView;
    private TextView scoreView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        gameView = findViewById(R.id.game_view);
        scoreView = findViewById(R.id.score_view);
        gameView.setScoreView(scoreView);
    }
}

activity_main.xml中的代码：

<?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"
    tools:context=".MainActivity">

    <com.example.tetris.GameView
        android:id="@+id/game_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <TextView
        android:id="@+id/score_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Score: 0"
        android:textSize="24sp"
        android:textStyle="bold"
        android:layout_alignParentTop="true"
        android:layout_alignParentEnd="true"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="16dp" />

</RelativeLayout>

--相关问题--: