Android平铺位图

Question

我正在尝试在Android中加载我想要平铺的位图。我目前在视图中使用以下内容来显示位图：

canvas.drawBitmap(bitmap, srcRect, destRect, null)

我基本上想在我的应用程序中将此位图用作背景图像，并希望在X和Y方向上重复位图。

我已经看到了BitmapShader类的TileMode.REPEAT常量，但我不确定这是用于重复实际位图还是用于将过滤器应用于位图。

Answer 1

您可以在xml而不是java代码中执行此操作。我自己没有尝试过，但我确实找到了这个例子。

<xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:id="@+id/MainLayout"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:background="@drawable/backrepeat"
>

然后在一个名为backrepeat.xml的xml中

<bitmap xmlns:android="http://schemas.android.com/apk/res/android"
    android:src="@drawable/back" 
    android:tileMode="repeat" />

reference

Answer 2

找出代码版本：

  BitmapDrawable TileMe = new BitmapDrawable(MyBitmap);
  TileMe.setTileModeX(Shader.TileMode.REPEAT);
  TileMe.setTileModeY(Shader.TileMode.REPEAT);

  ImageView Item = new ImageView(this);
  Item.setBackgroundDrawable(TileMe);

然后，如果你有一个drawable to tile，可以使用它来代替BitmapDrawable：

  BitmapDrawable TileMe = new BitmapDrawable(BitmapFactory.decodeResource(getResources(), R.drawable.tile));

Answer 3

上面的backrepeat.xml是错误的

<bitmap
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:src="@drawable/tile"
    android:tileMode="repeat"
    android:dither="true" />

Answer 4

似乎有些人有兴趣在onDraw方法的View中执行此操作。以下代码对我有用：

bgTile = BitmapFactory.decodeResource(context.getResources(), R.drawable.bg_tile);

float left = 0, top = 0;
float bgTileWidth = bgTile.getWidth();
float bgTileHeight = bgTile.getHeight();

while (left < screenWidth) {
    while (top < screenHeight) {
        canvas.drawBitmap(bgTile, left, top, null);
        top += bgTileHeight;
    }
    left += bgTileWidth;
    top = 0;
}

Answer 5

<xml version="1.0" encoding="utf-8"?>
<LinearLayout
    android:id="@+id/MainLayout"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:background="@drawable/back"
    android:tileMode="repeat"
>

这对我来说很好。我没有必要单独创建位图。我在布局中使用了tileMode属性。

Answer 6

将这行代码放在onCreate（）中： -

 final Bitmap bmp = BitmapFactory.decodeResource(getResources(),R.drawable.actionbar_bg);
 final BitmapDrawable bitmapDrawable = new BitmapDrawable(bmp);
 bitmapDrawable.setTileModeXY(Shader.TileMode.REPEAT, Shader.TileMode.REPEAT);
 final ActionBar bar = getSupportActionBar();
 bar.setBackgroundDrawable(bitmapDrawable);

Answer 7

如果只想垂直重复背景，可以将布局的宽度设置为“wrap_content”，而如果要将背景设置为水平重复，请将高度设置为“wrap_content”。如果高度和宽度都设置为“fill_parent”，那么它将在X和Y方向上平铺。

例如，以下代码将垂直重复您的背景：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="fill_parent"
    android:background="@drawable/news_detail_activity_bg">
</LinearLayout>

Answer 8

/* Tiled Layer Bitmap*/


public class TiledLayer {
private int cellWidth;
private int cellHeight;
private int yPosition = 0, xPosition = 0;
private int[][] grid;
private Image image;
private int[] tileXPositions;
private int[] tileYPositions;
private ArrayList animatedTiles;
private int numberOfTiles;
private int numberOfColumns;
private int numberOfRows;
private int gridColumns;
private int gridRows, width, height;

public TiledLayer(Image image, int columns, int rows, int tileWidth,
        int tileHeight, int width, int height) {
    this.grid = new int[columns][rows];
    this.gridColumns = columns;
    this.gridRows = rows;
    this.width = columns * tileWidth;
    this.height = rows * tileHeight;
    this.animatedTiles = new ArrayList();
    setStaticTileSet(image, tileWidth, tileHeight);
}

public void setStaticTileSet(Image image, int tileWidth, int tileHeight) {
    this.image = image;
    this.cellWidth = tileWidth;
    this.cellHeight = tileHeight;
    int columns = 64;//image.getWidth() / tileWidth;
    int rows =40;// image.getHeight() / tileHeight;
    this.tileXPositions = new int[columns];
    int pos = 0;
    for (int i = 0; i < columns; i++) {
        this.tileXPositions[i] = pos;
        pos += tileWidth;
    }
    this.tileYPositions = new int[rows];
    pos = 0;
    for (int i = 0; i < rows; i++) {
        this.tileYPositions[i] = pos;
        pos += tileHeight;
    }

    if (columns * rows < this.numberOfTiles) {
        // clear the grid, when there are not as many tiles as in the
        // previous set:
        for (int i = 0; i < this.grid.length; i++) {
            for (int j = 0; j < this.grid[i].length; j++) {
                this.grid[i][j] = 0;
            }
        }
    }
    this.numberOfTiles = columns * rows;
    this.numberOfColumns = columns;
    this.numberOfRows = rows;
}

public int createAnimatedTile(int staticTileIndex) {
    if (staticTileIndex >= this.numberOfTiles) {

        throw new IllegalArgumentException("invalid static tile index: "
                + staticTileIndex + " (there are only ["
                + this.numberOfTiles + "] tiles available.");

    }
    this.animatedTiles.add(new Integer(staticTileIndex));
    return -1 * (this.animatedTiles.size() - 1);
}

public void setAnimatedTile(int animatedTileIndex, int staticTileIndex) {
    if (staticTileIndex >= this.numberOfTiles) {

    }
    int animatedIndex = (-1 * animatedTileIndex) - 1;
    this.animatedTiles.set(animatedIndex, new Integer(staticTileIndex));
 }

 public int getAnimatedTile(int animatedTileIndex) {
    int animatedIndex = (-1 * animatedTileIndex) - 1;
    Integer animatedTile = (Integer) this.animatedTiles.get(animatedIndex);
    return animatedTile.intValue();
 }
 public void setCell(int col, int row, int tileIndex) {
    if (tileIndex >= this.numberOfTiles) {

        throw new IllegalArgumentException("invalid static tile index: "
                + tileIndex + " (there are only [" + this.numberOfTiles
                + "] tiles available.");

    }
    this.grid[col][row] = tileIndex;
}

 public int getCell(int col, int row) {
    return this.grid[col][row];
 }

 public void fillCells(int col, int row, int numCols, int numRows,
        int tileIndex) {
    if (tileIndex >= this.numberOfTiles) {

        throw new IllegalArgumentException("invalid static tile index: "
                + tileIndex + " (there are only [" + this.numberOfTiles
                + "] tiles available.");

    }
    int endCols = col + numCols;
    int endRows = row + numRows;
    for (int i = col; i < endCols; i++) {
        for (int j = row; j < endRows; j++) {
            this.grid[i][j] = tileIndex;
        }
    }
 }

    public final int getCellWidth() {
    return this.cellWidth;
 }

    public final int getCellHeight() {
    return this.cellHeight;
 }

 public final int getColumns() {
    return this.gridColumns;
 }

public final int getRows() {
    return this.gridRows;
}

public final void paint(Graphics g) {
    int clipX = 0;// g.getClipX();
    int clipY = 0;// g.getClipY();
    int clipWidth = width;// g.getClipWidth();
    int clipHeight = height;// g.getClipHeight();

    // jmt restore clip to previous state

    int x = this.xPosition;
    int y = this.yPosition;
    int[][] gridTable = this.grid;
    for (int i = 0; i < this.gridColumns; i++) {
        int[] gridRow = gridTable[i];
        for (int j = 0; j < gridRow.length; j++) {
            int cellIndex = gridRow[j];
            if (cellIndex != 0) {
                // okay this cell needs to be rendered:
                int tileIndex;
                if (cellIndex < 0) {
                    Integer tile = (Integer) this.animatedTiles
                            .get((-1 * cellIndex) - 1);
                    tileIndex = tile.intValue() - 1;
                } else {
                    tileIndex = cellIndex - 1;
                }
                // now draw the tile:
                g.save(Canvas.CLIP_SAVE_FLAG);
                // jmt: clear the screen
                Rect r = new Rect(0, 0, cellWidth, cellHeight);
                g.clipRect(r);
                g.setClip(x, y, this.cellWidth, this.cellHeight);
                int column = tileIndex % this.numberOfColumns;
                int row = tileIndex / this.numberOfColumns;
                int tileX = x - this.tileXPositions[column];
                int tileY = y - this.tileYPositions[row];

                g.drawImage(this.image, tileX, tileY);
                g.restore();
            }
            y += this.cellHeight;
        } // for each row
        y = this.yPosition;
        x += this.cellWidth;
    } // for each column

        // reset original clip:
        g.setClip(clipX, clipY, clipWidth, clipHeight);
     }
}