pictures.java

android 例子中的确良ApiDemos。很有代表意义

/*
 * Copyright (C) 2008 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 android.app.Activity;
import android.content.Context;
import android.graphics.*;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.PictureDrawable;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;

import java.io.*;

public class Pictures extends GraphicsActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(new SampleView(this));
    }
    
    private static class SampleView extends View {
        private Picture mPicture;
        private Drawable mDrawable;

        static void drawSomething(Canvas canvas) {
            Paint p = new Paint(Paint.ANTI_ALIAS_FLAG);
            
            p.setColor(0x88FF0000);
            canvas.drawCircle(50, 50, 40, p);
            
            p.setColor(Color.GREEN);
            p.setTextSize(30);
            canvas.drawText("Pictures", 60, 60, p);
        }

        public SampleView(Context context) {
            super(context);
            setFocusable(true);
            setFocusableInTouchMode(true);

            mPicture = new Picture();
            drawSomething(mPicture.beginRecording(200, 100));
            mPicture.endRecording();
            
            mDrawable = new PictureDrawable(mPicture);
        }
        
        @Override protected void onDraw(Canvas canvas) {
            canvas.drawColor(Color.WHITE);

            canvas.drawPicture(mPicture);
            
            canvas.drawPicture(mPicture, new RectF(0, 100, getWidth(), 200));
            
            mDrawable.setBounds(0, 200, getWidth(), 300);
            mDrawable.draw(canvas);
            
            ByteArrayOutputStream os = new ByteArrayOutputStream();
            mPicture.writeToStream(os);
            InputStream is = new ByteArrayInputStream(os.toByteArray());
            canvas.translate(0, 300);
            canvas.drawPicture(Picture.createFromStream(is));
        }
    }
}