自定义view之如何在给定汉字上加上田字格

用自定义view进行这个行为，可以在不限定字数的情况下，给想输入的汉字加上田字格：

废话不多说，上代码：MainActivity：


	import android.support.v7.app.AppCompatActivity;
	import android.os.Bundle;

	public class MainActivity extends AppCompatActivity {
	EnclosureShapeView esView;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.activity_main);
	esView = (EnclosureShapeView) findViewById(R.id.esv);
	esView.setText("好好学习天天向上，北京欢迎你，中国万岁");
	esView.setTextSize(200f);
	}
	}

： EnclosureShapeView

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.DashPathEffect;

import android.graphics.Paint;

import android.graphics.Path;

import android.graphics.Typeface;

import android.support.annotation.Nullable;

import android.text.TextUtils;

import android.util.AttributeSet;

import android.view.View;

/**

* Created by Administrator on 2017/10/20.

public class EnclosureShapeView extends View {

private Paint textPaint;

private Paint enclosurePaint;

/* 田字框的内边距 */

private float leftPadding = 10;

private float rightPadding = 10;

private float topPadding = 10;

private float bottomPadding = 10;

/* 田字框的内边距 */

private String mText;

// 默认文本大小为50

private float mTextSize = 50f;

private Paint dashPaint;

public EnclosureShapeView(Context context, @Nullable AttributeSet attrs) {

super(context, attrs);

initTextPaint();

initEnclosurePaint();

}

private void initEnclosurePaint() {

enclosurePaint = new Paint();

enclosurePaint.setColor(Color.BLUE);

enclosurePaint.setAntiAlias(true);

enclosurePaint.setStrokeWidth(5);

enclosurePaint.setStyle(Paint.Style.STROKE);

dashPaint = new Paint();

dashPaint.setColor(Color.BLUE);

dashPaint.setAntiAlias(true);

dashPaint.setStrokeWidth(5);

dashPaint.setStyle(Paint.Style.STROKE);

dashPaint.setPathEffect(new DashPathEffect(new float[]{15, 20}, 0));

}

private void initTextPaint() {

textPaint = new Paint();

textPaint.setTextSize(mTextSize);

textPaint.setAntiAlias(true);

textPaint.setColor(Color.BLACK);

textPaint.setTextAlign(Paint.Align.CENTER);

}

@Override

protected void onDraw(Canvas canvas) {

super.onDraw(canvas);

EnclosureMetrics em = getEnclosureSize();

for (int i = 0; i < em.rows; i++) {

canvas.translate(0, i == 0 ? 20 : em.height + 20);

canvas.save();

canvas.translate(20, 0);

for (int j = 0; j < em.columns; j++) {

String text;

try {

int index = j + i * em.columns;

text = mText.substring(index, index + 1);

} catch (Exception e) {

text = "";

}

// 如果已经没有文字可画了，可以停止画田字格

if (TextUtils.isEmpty(text))

break;

drawEnclosure(canvas, em);

drawText(text, canvas, em);

canvas.translate(em.width, 0);

}

canvas.restore();

}

private void drawText(String text, Canvas canvas, EnclosureMetrics em) {

Paint.FontMetrics fm = textPaint.getFontMetrics();

canvas.drawText(text, em.width / 2, em.height / 2 + (fm.bottom - fm.top) / 2 - fm.bottom, textPaint);

}

private void drawEnclosure(Canvas canvas, EnclosureMetrics em) {

canvas.drawRect(0, 0, em.width, em.height, enclosurePaint);

Path path = new Path();

path.lineTo(em.width, em.height);

canvas.drawPath(path, dashPaint);

path.reset();

path.moveTo(0, em.height);

path.lineTo(em.width, 0);

canvas.drawPath(path, dashPaint);

path.reset();

path.moveTo(0, em.height / 2);

path.lineTo(em.width, em.height / 2);

canvas.drawPath(path, dashPaint);

path.reset();

path.moveTo(em.width / 2, 0);

path.lineTo(em.width / 2, em.height);

canvas.drawPath(path, dashPaint);

}

public void setText(String text) {

mText = text;

invalidate();

}

public void setTextSize(float textSize) {

mTextSize = textSize;

initTextPaint();

invalidate();

}

public EnclosureMetrics getEnclosureSize() {

EnclosureMetrics em = new EnclosureMetrics();

Paint.FontMetrics fm = textPaint.getFontMetrics();

em.height = fm.bottom - fm.top + topPadding + bottomPadding;

em.width = textPaint.measureText(mText.substring(0, 1)) + leftPadding + rightPadding;

em.columns = (int) (getMeasuredWidth() / em.width);

em.rows = (int) Math.ceil((float) mText.length() / em.columns);

// 如果view的宽度能显示的列数超过了文字的个数，将列数置为文字的个数，行数置为1

if (em.columns >= mText.length()) {

em.columns = mText.length();

em.rows = 1;

}

return em;

}

public static class EnclosureMetrics {

public float width;

public float height;

public int rows;

public int columns;

}

main_activity:

<?xml version="1.0" encoding="utf-8"?>
	<android.support.constraint.ConstraintLayout 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="com.project.zero.enclosureshapeview.MainActivity">

	<com.project.zero.enclosureshapeview.EnclosureShapeView
	android:id="@+id/esv"
	android:layout_width="match_parent"
	android:layout_height="match_parent" />

	</android.support.constraint.ConstraintLayout>

Jump to Line

自定义view之如何在给定汉字上加上田字格

猜你喜欢