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使用这个位图作为背景图像，并希望在 X 和 Y 方向上重复该位图。
我已经看到 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对位图应用过滤器。
【问题讨论】：
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" />
【讨论】：
上面的 backrepeat.xml 有问题
<bitmap
xmlns:android="http://schemas.android.com/apk/res/android"
android:src="@drawable/tile"
android:tileMode="repeat"
android:dither="true" />
【讨论】：
弄清楚代码版本：
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，如果您有一个可绘制的平铺，则可以使用它来制作 BitmapDrawable：
BitmapDrawable TileMe = new BitmapDrawable(BitmapFactory.decodeResource(getResources(), R.drawable.tile));
【讨论】：
Shader.TileMode.CLAMP，然后看看会发生什么。
似乎有些人有兴趣在 View 的 onDraw 方法中执行此操作。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;
}
【讨论】：
<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。我不必单独创建位图。我在布局中使用了 tileMode 属性。
【讨论】：
如果您只想垂直重复背景，您可以将布局的宽度设置为“wrap_content”，而如果您想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>
【讨论】：
只需将这行代码放在onCreate()中即可：-
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);
【讨论】：
/* 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);
}
}
【讨论】：