Learn android together and add graffiti (text) to images (37 ),

Learn android together and add graffiti (text) to images (37 ),

Source image:

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The Code is as follows:

Public class GraffitiView extends View {private Paint paint = null;/** source map */private Bitmap originalBitmap = null;/** images to be graffiti */private Bitmap new1Bitmap = null; /** before graffiti */private Bitmap new2Bitmap = null;/** X and Y coordinates of the touch */private float clickX = 0; private float clickY = 0; /** start point of each painting */private float startX = 0; private float startY = 0;/** whether to draw */private boolean isMove = true ;/* * Whether to clear */private boolean isClear = false;/** paint color */private int Color = color. GREEN;/** tip size */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 pro Tected void onDraw (Canvas canvas) {super. onDraw (canvas); canvas. drawBitmap (HandWriting (new1Bitmap, isClear), 0, 0, null );} /***** graffiti pattern * @ param originalBitmap * @ param isClear whether to clear * @ return graffiti pattern */public Bitmap HandWriting (Bitmap originalBitmap, boolean isClear) {Canvas canvas = null; if (isClear) {// clear canvas = new Canvas (new2Bitmap);} else {// do not clear canvas = new Canvas (originalBitmap);} paint = New Paint (); paint. setStyle (Style. STROKE); paint. setAntiAlias (true); paint. setColor (color); paint. setStrokeWidth (strokeWidth); if (isMove) {// draw a canvas when moving. drawLine (startX, startY, clickX, clickY, paint);}/** start point of each painting */startX = clickX; startY = clickY; if (isClear) {// clear return new2Bitmap;} return originalBitmap;} @ Override public boolean onTouchEvent (MotionEvent event) {clickX = event. get X (); clickY = event. getY (); if (event. getAction () = MotionEvent. ACTION_DOWN) {/** refresh, but not draw, when pressing, but record the coordinate point when pressing, according to (isMove ). */IsMove = false; invalidate (); return true;} else if (event. getAction () = MotionEvent. ACTION_MOVE) {/** when moving, draw according to (isMove), starting from the coordinate point pressed. */IsMove = true; invalidate (); return true;} return super. onTouchEvent (event);}/*** clear */public void clear () {isClear = true; new2Bitmap = Bitmap. createBitmap (originalBitmap); invalidate ();}/*** set the width of the graffiti line * @ param strokeWidth */public void setstyle (float strokeWidth) {this. strokeWidth = strokeWidth;}/*** set the paint brush color * @ param color */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 = "clear screen"/> </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();}});}}

For more information, see http://blog.csdn.net/hai_qing_xu_kong/article/details/45620.93# _