textpaint的高度Android
时间: 2024-05-16 17:14:06 浏览: 17
在Android中,可以使用TextPaint对象来设置文本的样式和属性,包括文本的字体、大小、颜色、行距等。要获取文本的高度,可以使用TextPaint的measureText()方法和getTextBounds()方法。
如果要获取文本的实际高度,可以使用getTextBounds()方法,该方法需要一个Rect对象来存储测量结果。例如:
```
TextPaint textPaint = new TextPaint();
textPaint.setTextSize(24);
String text = "Hello, world!";
Rect bounds = new Rect();
textPaint.getTextBounds(text, 0, text.length(), bounds);
int height = bounds.height();
```
如果要获取文本的行高,可以使用measureText()方法,该方法返回文本的宽度。要计算文本的行高,可以将文本宽度除以行数。例如:
```
TextPaint textPaint = new TextPaint();
textPaint.setTextSize(24);
String text = "Hello, world!";
int lineCount = 2;
float textWidth = textPaint.measureText(text);
float lineHeight = textWidth / lineCount;
```
相关问题
android drawtext 换行
在 Android 中,可以使用 `StaticLayout` 或 `DynamicLayout` 来实现 `DrawText` 的自动换行。
以下是一个示例代码:
```
String text = "这是一个需要换行的文本,用于演示";
TextPaint textPaint = new TextPaint();
textPaint.setTextSize(40); // 设置字体大小
textPaint.setColor(Color.BLACK); // 设置字体颜色
int width = 500; // 限定宽度
Layout.Alignment align = Layout.Alignment.ALIGN_CENTER; // 居中对齐
StaticLayout staticLayout = new StaticLayout(text, textPaint, width, align, 1.0f, 0, false);
staticLayout.draw(canvas); // 绘制文字
```
其中,`StaticLayout` 的构造函数参数说明如下:
- `text`:要绘制的文本
- `textPaint`:绘制文本的画笔
- `width`:限定的宽度
- `align`:对齐方式
- `spacingMult`:行间距倍数
- `spacingAdd`:行间距增量
- `includePad`:是否包含上下内边距
如果需要支持动态修改文本,可以使用 `DynamicLayout`,其用法与 `StaticLayout` 类似。
android 文本高斯模糊
实现 Android 文本高斯模糊可以使用 RenderScript 或 Bitmap API。
使用 RenderScript 进行文本高斯模糊:
1. 创建 RenderScript 对象
```
RenderScript rs = RenderScript.create(context);
```
2. 创建用于高斯模糊的脚本
```
ScriptIntrinsicBlur script = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));
```
3. 将文本转换为 Bitmap 对象
```
TextPaint textPaint = new TextPaint();
textPaint.setColor(Color.WHITE);
textPaint.setTextSize(50);
StaticLayout staticLayout = new StaticLayout(text, textPaint, width, Layout.Alignment.ALIGN_NORMAL, 1.0f, 0.0f, false);
Bitmap bitmap = Bitmap.createBitmap(staticLayout.getWidth(), staticLayout.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
staticLayout.draw(canvas);
```
4. 将 Bitmap 转换为 Allocation 对象
```
Allocation input = Allocation.createFromBitmap(rs, bitmap);
Allocation output = Allocation.createTyped(rs, input.getType());
```
5. 设置高斯模糊半径并执行高斯模糊
```
script.setRadius(radius);
script.setInput(input);
script.forEach(output);
```
6. 将高斯模糊后的结果绘制到 Canvas 上
```
output.copyTo(bitmap);
canvas.drawBitmap(bitmap, 0, 0, null);
```
完整代码:
```
RenderScript rs = RenderScript.create(context);
ScriptIntrinsicBlur script = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));
TextPaint textPaint = new TextPaint();
textPaint.setColor(Color.WHITE);
textPaint.setTextSize(50);
StaticLayout staticLayout = new StaticLayout(text, textPaint, width, Layout.Alignment.ALIGN_NORMAL, 1.0f, 0.0f, false);
Bitmap bitmap = Bitmap.createBitmap(staticLayout.getWidth(), staticLayout.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
staticLayout.draw(canvas);
Allocation input = Allocation.createFromBitmap(rs, bitmap);
Allocation output = Allocation.createTyped(rs, input.getType());
script.setRadius(radius);
script.setInput(input);
script.forEach(output);
output.copyTo(bitmap);
canvas.drawBitmap(bitmap, 0, 0, null);
```
使用 Bitmap API 进行文本高斯模糊:
1. 将文本绘制到 Bitmap 上
```
TextPaint textPaint = new TextPaint();
textPaint.setColor(Color.WHITE);
textPaint.setTextSize(50);
StaticLayout staticLayout = new StaticLayout(text, textPaint, width, Layout.Alignment.ALIGN_NORMAL, 1.0f, 0.0f, false);
Bitmap bitmap = Bitmap.createBitmap(staticLayout.getWidth(), staticLayout.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
staticLayout.draw(canvas);
```
2. 调用 Bitmap 的 blur 方法进行高斯模糊
```
bitmap = bitmap.copy(bitmap.getConfig(), true);
Bitmap blurredBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888);
RenderScript rs = RenderScript.create(context);
Allocation input = Allocation.createFromBitmap(rs, bitmap);
Allocation output = Allocation.createFromBitmap(rs, blurredBitmap);
ScriptIntrinsicBlur script = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));
script.setRadius(radius);
script.setInput(input);
script.forEach(output);
output.copyTo(blurredBitmap);
```
3. 将高斯模糊后的结果绘制到 Canvas 上
```
canvas.drawBitmap(blurredBitmap, 0, 0, null);
```
完整代码:
```
TextPaint textPaint = new TextPaint();
textPaint.setColor(Color.WHITE);
textPaint.setTextSize(50);
StaticLayout staticLayout = new StaticLayout(text, textPaint, width, Layout.Alignment.ALIGN_NORMAL, 1.0f, 0.0f, false);
Bitmap bitmap = Bitmap.createBitmap(staticLayout.getWidth(), staticLayout.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
staticLayout.draw(canvas);
bitmap = bitmap.copy(bitmap.getConfig(), true);
Bitmap blurredBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888);
RenderScript rs = RenderScript.create(context);
Allocation input = Allocation.createFromBitmap(rs, bitmap);
Allocation output = Allocation.createFromBitmap(rs, blurredBitmap);
ScriptIntrinsicBlur script = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));
script.setRadius(radius);
script.setInput(input);
script.forEach(output);
output.copyTo(blurredBitmap);
canvas.drawBitmap(blurredBitmap, 0, 0, null);
```