/* * Copyright (C) 2007 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *      http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package com.example.android.apis.graphics;import com.example.android.apis.R;import android.app.Activity;import android.content.Context;import android.graphics.*;import android.os.Bundle;import android.view.KeyEvent;import android.view.*;public class MeasureText extends GraphicsActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(new SampleView(this));    }        private static final int WIDTH = 50;    private static final int HEIGHT = 50;    private static final int STRIDE = 64;   // must be >= WIDTH        private static int[] createColors() {        int[] colors = new int[STRIDE * HEIGHT];        for (int y = 0; y < HEIGHT; y++) {            for (int x = 0; x < WIDTH; x++) {                int r = x * 255 / (WIDTH - 1);                int g = y * 255 / (HEIGHT - 1);                int b = 255 - Math.min(r, g);                int a = Math.max(r, g);                colors[y * STRIDE + x] = (a << 24) | (r << 16) | (g << 8) | b;            }        }        return colors;    }        private static class SampleView extends View {        private Paint   mPaint;        private float   mOriginX = 10;        private float   mOriginY = 80;                public SampleView(Context context) {            super(context);            setFocusable(true);                        mPaint = new Paint();            mPaint.setAntiAlias(true);            mPaint.setStrokeWidth(5);            mPaint.setStrokeCap(Paint.Cap.ROUND);            mPaint.setTextSize(64);            mPaint.setTypeface(Typeface.create(Typeface.SERIF,                                               Typeface.ITALIC));        }                private void showText(Canvas canvas, String text, Paint.Align align) {         //   mPaint.setTextAlign(align);                        Rect    bounds = new Rect();            float[] widths = new float[text.length()];            int count = mPaint.getTextWidths(text, 0, text.length(), widths);            float w = mPaint.measureText(text, 0, text.length());            mPaint.getTextBounds(text, 0, text.length(), bounds);                        mPaint.setColor(0xFF88FF88);            canvas.drawRect(bounds, mPaint);            mPaint.setColor(Color.BLACK);            canvas.drawText(text, 0, 0, mPaint);                        float[] pts = new float[2 + count*2];            float x = 0;            float y = 0;            pts[0] = x;            pts[1] = y;            for (int i = 0; i < count; i++) {                x += widths[i];                pts[2 + i*2] = x;                pts[2 + i*2 + 1] = y;            }            mPaint.setColor(Color.RED);            mPaint.setStrokeWidth(0);            canvas.drawLine(0, 0, w, 0, mPaint);            mPaint.setStrokeWidth(5);            canvas.drawPoints(pts, 0, (count + 1) << 1, mPaint);        }                @Override protected void onDraw(Canvas canvas) {            canvas.drawColor(Color.WHITE);                        canvas.translate(mOriginX, mOriginY);                        showText(canvas, "Measure", Paint.Align.LEFT);            canvas.translate(0, 80);            showText(canvas, "wiggy!", Paint.Align.CENTER);            canvas.translate(0, 80);            showText(canvas, "Text", Paint.Align.RIGHT);        }    }}