Bitmap绘图

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自定义绘图 View

package com.test.jiazaibigimage;import android.content.Context;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Path;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;/** * Created by Administrator on 2016/6/25. */public class DrawView extends View {    float preX;    float preY;    private Path path;    public Paint mPaint = null;    public static final int VIEW_WIDTH = 1080;    public static final int VIEW_HEIGHT = 1920;    //定义一个副本的图片,该图片作为缓冲区    Bitmap copyBitmap = null;    //定义 copyBitmap上 Canvas对象    Canvas copyCanvas = null;    public DrawView(Context context, AttributeSet attrs) {        super(context, attrs);        **//创建一个和 View相同大小的 副本        copyBitmap = Bitmap.createBitmap(VIEW_WIDTH, VIEW_HEIGHT, Bitmap.Config.ARGB_8888);**        copyCanvas = new Canvas();        path = new Path();        //设置将 copyCanvas 将会绘制到 copyBitmap 上        copyCanvas.setBitmap(copyBitmap);        //设置画笔的颜色        mPaint = new Paint(Paint.DITHER_FLAG);        mPaint.setColor(Color.RED);        //设置画笔的风格        mPaint.setStyle(Paint.Style.STROKE);        mPaint.setStrokeWidth(2);        //抗锯齿        mPaint.setAntiAlias(true);        mPaint.setDither(true);    }    @Override    public boolean onTouchEvent(MotionEvent event) {        //获取拖动事件的发生位置        float x = event.getX();        float y = event.getY();        switch (event.getAction()) {            case MotionEvent.ACTION_DOWN:                path.moveTo(x, y);                preX = x;                preY = y;                break;            case MotionEvent.ACTION_MOVE:                path.quadTo(preX, preY, x, y);                preX = x;                preY = y;                break;            case MotionEvent.ACTION_UP:                copyCanvas.drawPath(path, mPaint);                path.reset();                break;        }        invalidate();        return true;  //返回 true 表示自己出来该方法    }    @Override    protected void onDraw(Canvas canvas) {        Paint bmpPaint = new Paint();        //将 copyBitmap 绘制到 该组件上        canvas.drawBitmap(copyBitmap, 0, 0, bmpPaint);        canvas.drawPath(path, mPaint);    }}

绘图的主界面

package com.test.jiazaibigimage;import android.graphics.BlurMaskFilter;import android.graphics.Color;import android.graphics.EmbossMaskFilter;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.Menu;import android.view.MenuInflater;import android.view.MenuItem;/** * 绘图的主界面 */public class DrawViewActivity extends AppCompatActivity {    EmbossMaskFilter emboss;  // emboss可以翻译成 浮雕    BlurMaskFilter blur;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_draw_view);        emboss = new EmbossMaskFilter(new float[]{1.5f, 1.5f, 1.5f}, 0.6f, 6, 4.2f);        blur = new BlurMaskFilter(10, BlurMaskFilter.Blur.NORMAL);    }    //负责创建选项菜单    @Override    public boolean onCreateOptionsMenu(Menu menu) {        MenuInflater inflater = new MenuInflater(this);        //加载对应的布局文件        inflater.inflate(R.menu.my_menu, menu);        return super.onCreateOptionsMenu(menu);    }    //菜单项被单击后的回调方法    @Override    public boolean onOptionsItemSelected(MenuItem item) {        DrawView drawView = (DrawView) findViewById(R.id.draw);        //判断点击的是哪个菜单项,并有做出相应的处理        switch (item.getItemId()) {            case R.id.red:                drawView.mPaint.setColor(Color.RED);                item.setCheckable(true);                break;            case R.id.green:                drawView.mPaint.setColor(Color.GREEN);                item.setCheckable(true);                break;            case R.id.blue:                drawView.mPaint.setColor(Color.BLUE);                item.setCheckable(true);                break;            case R.id.width_1:                drawView.mPaint.setStrokeWidth(1);                break;            case R.id.width_3:                drawView.mPaint.setStrokeWidth(3);                break;            case R.id.width_5:                drawView.mPaint.setStrokeWidth(15);                break;            case R.id.blur:                drawView.mPaint.setMaskFilter(blur);                break;            case R.id.emboss:                drawView.mPaint.setMaskFilter(emboss);                break;        }        return true;    }}

菜单布局文件

<?xml version="1.0" encoding="utf-8"?><menu xmlns:android="http://schemas.android.com/apk/res/android">    <item android:title="@string/color">        <menu>            <!--定义一组单选菜单项-->            <group android:checkableBehavior="single">                <!--定义多个菜单项-->                <item                    android:id="@+id/red"                    android:title="@string/color_red"/>                <item                    android:id="@+id/green"                    android:title="@string/color_green"/>                <item                    android:id="@+id/blue"                    android:title="@string/color_blue"/>            </group>        </menu>    </item>    <item android:title="@string/width">        <menu>            <!--定义一组菜单项-->            <group>                <!--定义三个菜单项-->                <item                    android:id="@+id/width_1"                    android:title="@string/width_1"/>                <item                    android:id="@+id/width_3"                    android:title="@string/width_3"/>                <item                    android:id="@+id/width_5"                    android:title="@string/width_5"/>            </group>        </menu>    </item>    <item        android:id="@+id/blur"        android:title="@string/blur"/>    <item        android:id="@+id/emboss"        android:title="@string/emboss"/></menu>

布局xml文件

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"              android:layout_width="fill_parent"              android:layout_height="fill_parent"              android:orientation="vertical" >    <com.test.jiazaibigimage.DrawView        android:id="@+id/draw"        android:layout_width="match_parent"        android:layout_height="match_parent"        /></LinearLayout>

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