Android implements graffiti, saves graffiti images, and clears the screen

The code for customizing the view class is as follows:
[Html]
Package com. xy. tuya;
 
Import android. annotation. SuppressLint;
Import android. content. Context;
Import android. graphics. Bitmap;
Import android. graphics. BitmapFactory;
Import android. graphics. Canvas;
Import android. graphics. Color;
Import android. graphics. Paint;
Import android. graphics. Paint. Style;
Import android. OS. Handler;
Import android. OS. Message;
Import android. util. AttributeSet;
Import android. util. Log;
Import android. view. MotionEvent;
Import android. view. View;
 
Public class MyView extends View {
Private Paint paint = null;
Private Bitmap originalBitmap = null;
Private Bitmap new1Bitmap = null;
Private Bitmap new2Bitmap = null;
Private float clickX = 0, clickY = 0;
Private float startX = 0, startY = 0;
Private boolean isMove = true;
Private boolean isClear = false;
Private int color = Color. GREEN;
Private float strokeWidth = 2.0f;
 
Public MyView (Context context, AttributeSet attrs ){
Super (context, attrs );
OriginalBitmap = BitmapFactory. decodeResource (getResources (),
R. drawable. a1). copy (Bitmap. Config. ARGB_8888, true );
New1Bitmap = Bitmap. createBitmap (originalBitmap );
SetDrawingCacheEnabled (true );
Log. I ("RG", "new1Bitmap --- >>>" + new1Bitmap );
}
 
Public void clear (){
IsClear = true;
New2Bitmap = Bitmap. createBitmap (originalBitmap );
Invalidate ();
}
 
Bitmap saveImage = null;
 
Public Bitmap saveImage (){
If (saveImage = null ){
Return null;
}
Return saveImage;
}
 
Public void setImge (){
SaveImage = null;
}
 
Public void setstyle (float strokeWidth ){
This. strokeWidth = strokeWidth;
}
 
Handler handler1;
 
@ SuppressLint ("DrawAllocation ")
@ Override
Protected void onDraw (Canvas canvas ){
Super. onDraw (canvas );
Canvas. drawBitmap (HandWriting (new1Bitmap), 0, 0, null );
Handler1 = new Handler (){
 
@ Override
Public void handleMessage (Message msg ){
 
Log. I ("RG ","--------------------");
Int what = msg. what;
If (what = 2 ){
SaveImage = Bitmap. createBitmap (HandWriting (new1Bitmap ));
Message msg1 = new Message ();
Msg1 = Message. obtain (MainActivity. hh, 3 );
MainActivity. hh. sendMessage (msg1 );
}
Super. handleMessage (msg );
}
 
};
 
}
 
@ SuppressLint ("HandlerLeak ")
Handler handler;
 
Public Bitmap HandWriting (Bitmap originalBitmap ){
Handler = new Handler (){
 
@ Override
Public void handleMessage (Message msg ){
 
Int what = msg. what;
If (what = 1 ){
StartX = clickX;
StartY = clickY;
}
Super. handleMessage (msg );
}
 
};
Canvas canvas = null;
 
If (isClear ){
Canvas = new Canvas (new2Bitmap );
Log. I ("RG", "canvas ");
} Else {
Canvas = new Canvas (originalBitmap );
}
Paint = new Paint ();
Paint. setStyle (Style. STROKE );
Paint. setAntiAlias (true );
Paint. setColor (color );
Paint. setStrokeWidth (strokeWidth );
Log. I ("RG", "startX -- >>>" + startX );
Log. I ("RG", "startY -- >>>" + startY );
If (isMove ){
Canvas. drawLine (startX, startY, clickX, clickY, paint );
}
 
If (isClear ){
Return new2Bitmap;
}
 
Return originalBitmap;
}
 
@ Override
Public boolean onTouchEvent (MotionEvent event ){
Message msg = new Message ();
Msg = Message. obtain (handler, 1 );
Handler. sendMessage (msg );
ClickX = event. getX ();
ClickY = event. getY ();
If (event. getAction () = MotionEvent. ACTION_DOWN ){
 
IsMove = false;
Invalidate ();
Return true;
} Else if (event. getAction () = MotionEvent. ACTION_MOVE ){
 
IsMove = true;
Invalidate ();
Return true;
}
 
Return super. onTouchEvent (event );
}
 
}

The mainactiviry class code is as follows:
[Html]
Package com. xy. tuya;
 
Import android. opengl. Visibility;
Import android. OS. Bundle;
Import android. OS. Handler;
Import android. OS. Message;
Import android. app. Activity;
Import android. graphics. Bitmap;
Import android. graphics. drawable. Drawable;
Import android. util. Log;
Import android. view. Menu;
Import android. view. MenuItem;
Import android. view. View;
Import android. view. View. OnClickListener;
Import android. widget. Button;
Import android. widget. ImageView;
Import android. support. v4.app. NavUtils;
 
Public class MainActivity extends Activity {
/** Called when the activity is first created .*/
Private MyView handWrite = null;
Private Button clear = null;
Private Button save = null;
Private ImageView saveImage = null;
 
@ Override
Public void onCreate (Bundle savedInstanceState ){
Super. onCreate (savedInstanceState );
SetContentView (R. layout. activity_main );
 
HandWrite = (MyView) findViewById (R. id. handwriteview );
Save = (Button) findViewById (R. id. save );
SaveImage = (ImageView) findViewById (R. id. saveimage );
Clear = (Button) findViewById (R. id. clear );
Clear. setOnClickListener (new clearListener ());
Save. setOnClickListener (new saveListener ());
Handerl ();
}
 
Private class clearListener implements OnClickListener {
 
Public void onClick (View v ){
HandWrite. clear ();
}
}
 
Static Handler hh;
 
Public void handerl (){
Hh = new Handler (){
 
@ Override
Public void handleMessage (Message msg ){
Int what = msg. what;
If (what = 3 ){
SaveImage. setVisibility (View. VISIBLE );
SaveImage. setImageBitmap (handWrite. saveImage ());
HandWrite. setImge ();
}
Super. handleMessage (msg );
}
 
};
}
 
Private class saveListener implements OnClickListener {
 
@ Override
Public void onClick (View v ){
 
Message msg = new Message ();
Msg = Message. obtain (handWrite. handler1, 2 );
HandWrite. handler1.sendMessage (msg );
 
If (handWrite. saveImage ()! = Null ){
Log. I ("RG", "111111111111111111111 ");
 
} Else {
SaveImage. setVisibility (View. GONE );
}
}
 
}
}

The xml layout code is as follows:
[Html]
<? 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">
 
<LinearLayout
Android: layout_width = "fill_parent"
Android: layout_height = "wrap_content">
 
<Com. zte. tuya. MyView
Android: id = "@ + id/handwriteview"
Android: layout_width = "fill_parent"
Android: layout_height = "300dp"/>
</LinearLayout>
 
<LinearLayout
Android: layout_width = "wrap_content"
Android: layout_height = "40dip"
Android: orientation = "horizontal">
 
<Button
Android: id = "@ + id/clear"
Android: layout_width = "50dp"
Android: layout_height = "wrap_content"
Android: text = "clear screen"/>
 
<Button
Android: id = "@ + id/save"
Android: layout_width = "50dp"
Android: layout_height = "wrap_content"
Android: text = "save"/>
</LinearLayout>
 
<ImageView
Android: id = "@ + id/saveimage"
Android: layout_width = "wrap_content"
Android: layout_height = "wrap_content"/>
 
</LinearLayout>
 
The figure below is as follows: