一起学android之给图片添加涂鸦（文字）（37）

来源：互联网发布：阿里云 idc资质编辑：程序博客网时间：2024/06/01 12:23

原图：

效果图：

代码如下：

public class GraffitiView extends View  {      private Paint paint = null;      /*     * 源图     */    private Bitmap originalBitmap = null;     /*     * 需要涂鸦的图片     */    private Bitmap new1Bitmap = null;      /*     * 涂鸦之前     */    private Bitmap new2Bitmap = null;     /*     * 触摸时的X、Y坐标     */    private float clickX = 0;    private float clickY = 0;      /*     * 每次绘制的起点     */    private float startX = 0;    private float startY = 0;      /*     * 是否进行绘制     */    private boolean isMove = true;      /*     * 是否进行清空     */    private boolean isClear = false;      /*     * 画笔颜色     */    private int color = Color.GREEN;     /*     * 笔尖大小     */    private float strokeWidth = 2.0f;          public GraffitiView(Context context, AttributeSet attrs)      {          super(context, attrs);          originalBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.hh).copy(Bitmap.Config.ARGB_8888, true);          new1Bitmap = Bitmap.createBitmap(originalBitmap);      }                     @Override      protected void onDraw(Canvas canvas)      {          super.onDraw(canvas);          canvas.drawBitmap(HandWriting(new1Bitmap,isClear), 0, 0,null);                }            /**     *  * 涂鸦的图案     * @param originalBitmap     * @param isClear 是否清空     * @return 涂鸦的图案     */    public Bitmap HandWriting(Bitmap originalBitmap,boolean isClear)      {          Canvas canvas = null;                    if(isClear){  //清空            canvas = new Canvas(new2Bitmap);          }          else{  //不清空            canvas = new Canvas(originalBitmap);          }          paint = new Paint();          paint.setStyle(Style.STROKE);          paint.setAntiAlias(true);          paint.setColor(color);          paint.setStrokeWidth(strokeWidth);          if(isMove){  //当移动时绘制            canvas.drawLine(startX, startY, clickX, clickY, paint);          }          /*         * 每次绘制的起点           */        startX = clickX;          startY = clickY;                    if(isClear){  //清空            return new2Bitmap;          }          return originalBitmap;      }        @Override      public boolean onTouchEvent(MotionEvent event)      {          clickX = event.getX();          clickY = event.getY();          if(event.getAction() == MotionEvent.ACTION_DOWN){              /*             * 当按下，并不移动时，刷新，但不绘制，只是记录按下时的坐标点，根据（isMove）  。             */            isMove = false;              invalidate();              return true;          }          else if(event.getAction() == MotionEvent.ACTION_MOVE){          /*         *当移动时，根据(isMove)进行绘制，从按下的坐标点起。         */            isMove = true;              invalidate();              return true;          }                    return super.onTouchEvent(event);      }              /**     * 清空     */    public void clear(){          isClear = true;          new2Bitmap = Bitmap.createBitmap(originalBitmap);          invalidate();      }          /**     * 设置涂鸦线条的宽度     * @param strokeWidth 宽度     */    public void setstyle(float strokeWidth){          this.strokeWidth = strokeWidth;      }          /**     * 设置画笔颜色     * @param color 颜色     */    public void setColor(int color){    this.color=color;    }     }

activity_main.xml:

<?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.example.tuya.view.GraffitiView        android:id="@+id/handwriteview"        android:layout_width="fill_parent"        android:layout_height="500dp" />    <LinearLayout        android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:gravity="center_horizontal"        android:orientation="horizontal" >        <Button            android:id="@+id/clear"            android:layout_width="200dp"            android:layout_height="wrap_content"            android:text="清屏" />    </LinearLayout></LinearLayout>

MainActivity:

public class MainActivity extends Activity {private GraffitiView handWrite = null;private Button clear = null;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);handWrite = (GraffitiView) findViewById(R.id.handwriteview);handWrite.setstyle(10);handWrite.setColor(Color.RED);clear = (Button) findViewById(R.id.clear);clear.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {handWrite.clear();}});}}

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