一起學android之給圖片添加塗鴉（文字）（37），

一起學android之給圖片添加塗鴉（文字）（37），

原圖：

：

代碼如下：

public class GraffitiView extends View  {      private Paint paint = null;      /*     * 源圖     */    private Bitmap originalBitmap = null;     /*     * 需要塗鴉的圖片     */    private Bitmap new1Bitmap = null;      /*     * 塗鴉之前     */    private Bitmap new2Bitmap = null;     /*     * 觸摸時的X、Y座標     */    private float clickX = 0;    private float clickY = 0;      /*     * 每次繪製的起點     */    private float startX = 0;    private float startY = 0;      /*     * 是否進行繪製     */    private boolean isMove = true;      /*     * 是否進行清空     */    private boolean isClear = false;      /*     * 畫筆顏色     */    private int color = Color.GREEN;     /*     * 筆尖大小     */    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);                }            /**     *  * 塗鴉的圖案     * @param originalBitmap     * @param isClear 是否清空     * @return 塗鴉的圖案     */    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){  //當移動時繪製            canvas.drawLine(startX, startY, clickX, clickY, paint);          }          /*         * 每次繪製的起點           */        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){              /*             * 當按下，並不移動時，重新整理，但不繪製，只是記錄按下時的座標點，根據（isMove）  。             */            isMove = false;              invalidate();              return true;          }          else if(event.getAction() == MotionEvent.ACTION_MOVE){          /*         *當移動時，根據(isMove)進行繪製，從按下的座標點起。         */            isMove = true;              invalidate();              return true;          }                    return super.onTouchEvent(event);      }              /**     * 清空     */    public void clear(){          isClear = true;          new2Bitmap = Bitmap.createBitmap(originalBitmap);          invalidate();      }          /**     * 設定塗鴉線條的寬度     * @param strokeWidth 寬度     */    public void setstyle(float strokeWidth){          this.strokeWidth = strokeWidth;      }          /**     * 設定畫筆顏色     * @param color 顏色     */    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();}});}}

轉載請註明出處：http://blog.csdn.net/hai_qing_xu_kong/article/details/45643093情緒控_