在android中的fingerPaint api演示中保存用户制作的图像

概述大家好我正在尝试构建一个签名任务应用程序.用户将在其中创建触摸签名,该位图应保存在手机中.我创建了2个类文件,其中一个自定义视图与fingerpaint应用程序中的相同,并调用main.xml文件中的视图.在我的主应用程序类文件中,我有菜单按钮,在单击时保存sdcard中的位图.以下是代码：–

大家好
我正在尝试构建一个签名任务应用程序.
用户将在其中创建触摸签名,该位图应保存在手机中.
我创建了2个类文件,其中一个自定义视图与fingerpaint应用程序中的相同,并调用main.xml文件中的视图.

在我的主应用程序类文件中,我有菜单按钮,在单击时保存sdcard中的位图.以下是代码： –

package org.testCircle;import androID.app.Activity;import androID.graphics.Bitmap;import androID.graphics.Canvas;import androID.os.Bundle;import androID.provIDer.MediaStore.Images;import androID.vIEw.Menu;import androID.vIEw.MenuItem;import androID.Widget.TextVIEw;import androID.Widget.Toast;public class testCircle extends Activity {    TextVIEw tv;    /** Called when the activity is first created. */    @OverrIDe    public voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        //setContentVIEw(new customVIEw(this));        setContentVIEw(R.layout.main);    }    public boolean onCreateOptionsMenu(Menu menu) {        super.onCreateOptionsMenu(menu);        menu.add(0, 1, 0, "save").setShortcut('3', 'c');        return true;    }    public boolean onPrepareOptionsMenu(Menu menu) {        super.onPrepareOptionsMenu(menu);        return true;    }    @OverrIDe    public boolean onoptionsItemSelected(MenuItem item) {        switch (item.getItemID()) {        case 1:            //new colorPickerDialog(this, this, mPaint.getcolor()).show();            fingerPaint cv = new fingerPaint(this);            Bitmap vIEwBitmap = Bitmap.createBitmap(480, 800,Bitmap.Config.ARGB_8888);            Canvas canvas = new Canvas(vIEwBitmap);            cv.draw(canvas);            String url = Images.Media.insertimage(getContentResolver(), vIEwBitmap, "Title", null);            Toast.makeText(testCircle.this, url, Toast.LENGTH_LONG).show();            return true;    }        return super.onoptionsItemSelected(item);}}

自定义视图： –

package org.testCircle;import androID.content.Context;import androID.graphics.Bitmap;import androID.graphics.Canvas;import androID.graphics.Paint;import androID.graphics.Path;import androID.os.Bundle;import androID.util.AttributeSet;import androID.vIEw.MotionEvent;import androID.vIEw.VIEw;public class fingerPaint extends VIEw {    Paint mPaint;    private static final float MINP = 0.25f;    private static final float MAXP = 0.75f;    private static Bitmap  mBitmap;    private Canvas  mCanvas;    private Path    mPath;    private Paint   mBitmapPaint;    public fingerPaint(Context c) {        super(c);        mPaint = new Paint();        mPaint.setAntiAlias(true);        mPaint.setDither(true);        mPaint.setcolor(0xFFFF0000);        mPaint.setStyle(Paint.Style.stroke);        mPaint.setstrokeJoin(Paint.Join.ROUND);        mPaint.setstrokeCap(Paint.Cap.ROUND);        mPaint.setstrokeWIDth(12);        mBitmap = Bitmap.createBitmap(320, 480, Bitmap.Config.ARGB_8888);        mCanvas = new Canvas(mBitmap);        mPath = new Path();        mBitmapPaint = new Paint(Paint.DITHER_FLAG);    }    public fingerPaint(Context c , AttributeSet attrs){        super(c , attrs);         mPaint = new Paint();         mPaint.setAntiAlias(true);         mPaint.setDither(true);         mPaint.setcolor(0xFFFF0000);         mPaint.setStyle(Paint.Style.stroke);         mPaint.setstrokeJoin(Paint.Join.ROUND);         mPaint.setstrokeCap(Paint.Cap.ROUND);         mPaint.setstrokeWIDth(12);         mBitmap = Bitmap.createBitmap(320, 480, Bitmap.Config.ARGB_8888);         mCanvas = new Canvas(mBitmap);         mPath = new Path();         mBitmapPaint = new Paint(Paint.DITHER_FLAG);    }    public voID onerase(){        mCanvas=null;    }    @OverrIDe    protected voID onSizeChanged(int w, int h, int olDW, int oldh) {        super.onSizeChanged(w, h, olDW, oldh);    }    @OverrIDe    protected voID onDraw(Canvas canvas) {        canvas.drawcolor(0xFFAAAAAA);        canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);        canvas.drawPath(mPath, mPaint);    }    private float mX, mY;    private static final float touch_TolERANCE = 4;    private voID touch_start(float x, float y) {        mPath.reset();        mPath.moveto(x, y);        mX = x;        mY = y;    }    private voID touch_move(float x, float y) {        float dx = Math.abs(x - mX);        float dy = Math.abs(y - mY);        if (dx >= touch_TolERANCE || dy >= touch_TolERANCE) {            mPath.quadTo(mX, mY, (x + mX)/2, (y + mY)/2);            mX = x;            mY = y;        }        mCanvas.drawBitmap(mBitmap, mX, mY, mPaint);    }    private voID touch_up() {        mPath.lineto(mX, mY);        // commit the path to our offscreen        mCanvas.drawPath(mPath, mPaint);        // kill this so we don't double draw        mPath.reset();    }    @OverrIDe    public boolean ontouchEvent(MotionEvent event) {        float x = event.getX();        float y = event.getY();        switch (event.getAction()) {            case MotionEvent.ACTION_DOWN:                touch_start(x, y);                invalIDate();                break;            case MotionEvent.ACTION_MOVE:                touch_move(x, y);                invalIDate();                break;            case MotionEvent.ACTION_UP:                touch_up();                invalIDate();                Bundle b = new Bundle();                break;        }        return true;    }}

解决方法:

这是执行此 *** 作的源代码

linearLayout v = (linearLayout) findVIEwByID(R.ID.mainLayout);v.setDrawingCacheEnabled(true);// this is the important code :)// Without it the vIEw will have a// dimension of 0,0 and the bitmap will// be nullv.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UnspecIFIED), MeasureSpec.makeMeasureSpec(0, MeasureSpec.UnspecIFIED));v.layout(0, 0, v.getWIDth(), v.getHeight());v.buildDrawingCache(true);Bitmap bm = Bitmap.createBitmap(v.getDrawingCache());v.setDrawingCacheEnabled(false);if (bm != null) {    try {        String path = Environment.getExternalStorageDirectory().toString();        OutputStream fOut = null;        file file = new file(path, "screentest.jpg");        fOut = new fileOutputStream(file);        bm.compress(Bitmap.CompressFormat.JPEG, 85, fOut);        fOut.flush();        fOut.close();        Log.e("ImagePath", "Image Path : " + MediaStore.Images.Media.insertimage( getContentResolver(), file.getabsolutePath(), file.getname(), file.getname()));    }    catch (Exception e) {        e.printstacktrace();    }}

希望这也适合你.

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