Simple picture of Android

Layout

<LinearLayoutxmlns:android= "Http://schemas.android.com/apk/res/android"Xmlns:tools= "Http://schemas.android.com/tools"Android:layout_width= "Match_parent"Android:layout_height= "Match_parent"android:orientation= "vertical"Tools:context= "Com.example.paint.MainActivity" >    <ButtonAndroid:onclick= "Save"Android:id= "@+id/btn"Android:layout_width= "Fill_parent"Android:layout_height= "Wrap_content"Android:text= "Save" />    <ButtonAndroid:onclick= "Selectimage"Android:id= "@+id/select"Android:layout_width= "Fill_parent"Android:layout_height= "Wrap_content"Android:text= "Select a picture" />    <ImageViewAndroid:layout_above= "@id/select"Android:id= "@+id/iv"Android:layout_width= "Fill_parent"Android:layout_height= "Fill_parent"        /></LinearLayout>

Main_activity

 PackageCom.example.paint;ImportJava.io.File;ImportJava.io.FileOutputStream;Importandroid.content.Intent;ImportAndroid.graphics.Bitmap;ImportAndroid.graphics.Bitmap.CompressFormat;ImportAndroid.graphics.Bitmap.Config;ImportAndroid.graphics.Canvas;ImportAndroid.graphics.Color;ImportAndroid.graphics.Paint;ImportAndroid.net.Uri;ImportAndroid.os.Bundle;Importandroid.os.Environment;Importandroid.support.v7.app.ActionBarActivity;Importandroid.view.MotionEvent;ImportAndroid.view.View;ImportAndroid.view.View.OnTouchListener;ImportAndroid.widget.ImageView;ImportAndroid.widget.Toast; Public classMainactivityextendsactionbaractivity {PrivateImageView IV; PrivateBitmap Basebitmap; PrivateCanvas canvas;//Canvas        PrivatePaint paint;//Brushes@Overrideprotected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);                Setcontentview (R.layout.activity_main); Paint=NewPaint (); //Brush WidthPaint.setstrokewidth (5); //Brush ColorPaint.setcolor (Color.green); //Create a bitmap that can be modifiedBasebitmap = Bitmap.createbitmap (320, 350, config.argb_8888); //Create a canvasCanvas =NewCanvas (BASEBITMAP); //Set Background colorCanvas.drawcolor (Color.White); IV=(ImageView) Findviewbyid (R.ID.IV); //know the trajectory of the user's finger moving on the flat AmericaIv.setontouchlistener (NewOntouchlistener () {//gets the coordinates of the start position of the finger            intStartX; intStarty; @Override Public BooleanOnTouch (View V, motionevent event) {Switch(Event.getaction ()) { CaseMotionevent.action_down://Finger touch screen for the first timeStartX= (int) Event.getx (); Starty= (int) event.gety ();  Break;  CaseMotionevent.action_move://finger moves on the screen                                                intNewx = (int) Event.getx (); intNewy = (int) event.gety (); //Draw Linecanvas.drawline (StartX, Starty, Newy, newy, paint); //re-update brush start positionStartX = (int) Event.getx (); Starty= (int) event.gety ();                        Iv.setimagebitmap (BASEBITMAP);  Break;  CaseMOTIONEVENT.ACTION_UP://the movement of the finger off the screen                                                 Break; }                                //return True indicates that the brush has been touched                return true;    }                    }); }                 Public voidselectimage (view view) {Intent Intent=NewIntent ();        Intent.setaction (Intent.action_pick); Intent.settype ("Image/*"); Startactivityforresult (Intent,0); } @Overrideprotected voidOnactivityresult (intARG0,intarg1, Intent data) {        if(data!=NULL) {URI Uri=Data.getdata (); Bitmap Bitmap= Data.getparcelableextra ("Data"); Basebitmap=bitmap;                    Iv.setimageuri (URI); }        Super. Onactivityresult (arg0, arg1, data); }             Public voidSave (View view) {Try{File File=NewFile (Environment.getexternalstoragedirectory (), System.currenttimemillis () + ". jpg"); FileOutputStream Fos=Newfileoutputstream (file); //Save PictureBasebitmap.compress (Compressformat.jpeg, 100, FOS); Toast.maketext ( This, "Save picture succeeded", 0). Show (); //simulate a message notification System SD card is re-mountedIntent Intent =NewIntent ();            Intent.setaction (intent.action_media_mounted);            Intent.setdata (Uri.fromfile (Environment.getexternalstoragedirectory ()));                    Sendbroadcast (Intent); } Catch(Exception e) {Toast.maketext ( This, "Save picture Failed", 0). Show ();        E.printstacktrace (); }            }  }

Simple picture of Android