03 完整的签名模块代码

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image.png

一、布局

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#FFF"
    android:orientation="vertical">
    <com.xxt.xtest.AutographView
        android:id="@+id/autograph_view"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"/>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="20dp"
        android:gravity="center_vertical"
        android:orientation="horizontal">
        <TextView
            android:id="@+id/text_size_tv"
            android:layout_width="80dp"
            android:layout_height="wrap_content"
            android:text="Text Size: 4"/>
        <SeekBar
            android:id="@+id/seek_bar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <Button
            android:id="@+id/clear_btn"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Clear"
            android:background="#FFF"/>
        <Button
            android:id="@+id/undo_btn"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Undo"
            android:background="#FFF"/>
        <Button
            android:id="@+id/redo_btn"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Redo"
            android:background="#FFF"/>
        <Button
            android:id="@+id/color_btn"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Color"
            android:background="#FFF"/>
        <Button
            android:id="@+id/save_btn"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Save"
            android:background="#FFF"/>
    </LinearLayout>
</LinearLayout>

二、DemoActivity

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public class DemoActivity extends AppCompatActivity implements View.OnClickListener {
    private AutographView mView;
    private TextView mSizeTV;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.act_demo);
        mView = findViewById(R.id.autograph_view);
        mView.setBackgroundColor(Color.TRANSPARENT);
        mView.setDrawingCacheEnabled(true);
        mSizeTV = findViewById(R.id.text_size_tv);
        SeekBar sizeSB = findViewById(R.id.seek_bar);
        sizeSB.setMax(24);
        sizeSB.setProgress(mView.getSize());
        sizeSB.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                if (fromUser) {
                    mView.setSize(progress);
                    String prompt = "Text Size: " + progress;
                    mSizeTV.setText(prompt);
                }
            }
            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {}
            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {}
        });
        findViewById(R.id.clear_btn).setOnClickListener(this);
        findViewById(R.id.undo_btn).setOnClickListener(this);
        findViewById(R.id.redo_btn).setOnClickListener(this);
        findViewById(R.id.color_btn).setOnClickListener(this);
        findViewById(R.id.save_btn).setOnClickListener(this);
    }
    @Override
    public void onClick(View v) {
        if (mView == null) return;
        switch (v.getId()) {
            case R.id.clear_btn:
                mView.clear();
                break;
            case R.id.undo_btn:
                mView.undo();
                break;
            case R.id.redo_btn:
                mView.redo();
                break;
            case R.id.color_btn:
                selectColor();
                break;
            case R.id.save_btn:
                save();
                break;
        }
    }
    private void selectColor() {
        new ColorPickerDialog(DemoActivity.this, new ColorPickerDialog.OnColorChangedListener() {
            @Override
            public void colorChanged(int color) {
                mView.setColor(color);
            }
        }, mView.getColor()).show();
    }
    private void save() {
        FileOutputStream out = null;
        String path = Environment.getExternalStorageDirectory() + "/sign_" + System.currentTimeMillis() + ".png";
        try {
            out = new FileOutputStream(path);
            boolean isSaveOk = mView.getDrawingCache().compress(CompressFormat.PNG, 100, out);
            if (isSaveOk) {
                Toast.makeText(DemoActivity.this, "保存成功：" + path, Toast.LENGTH_SHORT).show();
                // 发送邮件
                Intent i = new Intent(Intent.ACTION_SEND);
                i.setType("message/rfc822");
                i.putExtra(Intent.EXTRA_EMAIL, new String[]{"xianxiaotao@iCloud.com"});
                i.putExtra(Intent.EXTRA_SUBJECT, "先的签名");
                i.putExtra(Intent.EXTRA_TEXT, "如附件");
                i.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(new File(path)));
                startActivity(Intent.createChooser(i, "Send email..."));
            }
        } catch (Exception e) {
            Log.e("DemoActivity", e.getMessage());
        } finally {
            if (out != null) {
                try {
                    out.close();
                } catch (IOException e) {}
            }
        }
    }
}

三、自定义签名 View

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/**
 * 签名
 */
public class AutographView extends View {
    private Paint mPaint;
    // 笔画集合（字）
    private LinkedList<LinkedList<FPoint>> mLines;
    // 保存撤销的笔画，用于还原
    private LinkedList<LinkedList<FPoint>> mRecycles;
    private boolean isTouching;
    public AutographView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        mLines = new LinkedList<>();
        mRecycles = new LinkedList<>();
        mPaint = new Paint();
        mPaint.setColor(Color.GREEN);
        mPaint.setStrokeWidth(4);
        isTouching = false;
    }
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        // 离开屏幕
        if (event.getAction() == MotionEvent.ACTION_UP) {
            isTouching = false;
        } else {
            LinkedList<FPoint> line;
            // 触摸开始，则新建 line
            if (!isTouching) {
                line = new LinkedList<>();
                mLines.add(line);
                isTouching = true;
            }
            // 开始滑动，继续使用上一个 line
            else {
                line = mLines.getLast();
            }
            FPoint point = new FPoint(event.getX(), event.getY());
            line.add(point);
            postInvalidate();
        }
        return true;
    }
    @Override
    protected void onDraw(Canvas canvas) {
        for (LinkedList<FPoint> line : mLines) {
            // 至少有两点才需要画出线段
            if (line.size() > 1) {
                for (int i = 1; i < line.size(); i++) {
                    FPoint p1 = line.get(i - 1);
                    FPoint p2 = line.get(i);
                    canvas.drawLine(p1.x, p1.y, p2.x, p2.y, mPaint);
                }
            }
        }
    }
    /**
     * 清除
     */
    public void clear() {
        if (mRecycles != null) mRecycles.clear();
        if (mLines != null) {
            mLines.clear();
            postInvalidate();
        }
    }
    /**
     * 撤销
     */
    public void undo() {
        if (mLines != null && mLines.size() > 0 && mRecycles != null) {
            mRecycles.add(mLines.removeLast());
            postInvalidate();
        }
    }
    /**
     * 还原
     */
    public void redo() {
        if (mRecycles != null && mRecycles.size() > 0 && mLines != null) {
            mLines.add(mRecycles.removeLast());
            postInvalidate();
        }
    }
    /**
     * 获取字体的线条粗细
     * @return int
     */
    public int getSize() {
        return (int) mPaint.getStrokeWidth();
    }
    /**
     * 设置字体的线条粗细
     * @param size int
     */
    public void setSize(int size) {
        if (size > 0) {
            mPaint.setStrokeWidth(size);
            postInvalidate();
        }
    }
    public int getColor() {
        return mPaint.getColor();
    }
    public void setColor(int color) {
        mPaint.setColor(color);
    }
    private class FPoint {
        public float x, y;
        FPoint(float x, float y) {
            this.x = x;
            this.y = y;
        }
    }
}

四、自定义颜色选择器

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public class ColorPickerDialog extends Dialog {
    private OnColorChangedListener mListener;
    private int mInitialColor;
    protected ColorPickerDialog(@NonNull Context context, OnColorChangedListener listener,
                                int initialColor) {
        super(context);
        mListener = listener;
        mInitialColor = initialColor;
    }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        OnColorChangedListener l = new OnColorChangedListener() {
            @Override
            public void colorChanged(int color) {
                mListener.colorChanged(color);
                dismiss();
            }
        };
        setContentView(new ColorPickerView(getContext(), l, mInitialColor));
        setTitle("Pick a Color");
    }
    public interface OnColorChangedListener {
        void colorChanged(int color);
    }
    private static class ColorPickerView extends View {
        private Paint mPaint;
        private Paint mCenterPaint;
        private final int[] mColors;
        private OnColorChangedListener mListener;
        ColorPickerView(Context c, OnColorChangedListener l, int color) {
            super(c);
            mListener = l;
            mColors = new int[]{0xFFFF0000,0xFFFF00FF,0xFF0000FF,
                    0xFF00FFFF,0xFF00FF00,0xFFFFFF00,0xFFFF0000};
            Shader shader = new SweepGradient(0, 0, mColors, null);
            mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
            mPaint.setShader(shader);
            mPaint.setStyle(Paint.Style.STROKE);
            mPaint.setStrokeWidth(110);
            mCenterPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
            mCenterPaint.setColor(color);
            mCenterPaint.setStrokeWidth(5);
        }
        private boolean mTrackingCenter;
        private boolean mHighlightCenter;
        private static final int CENTER_X = 300;
        private static final int CENTER_Y = 300;
        private static final int CENTER_RADIUS = 110;
        private static final float PI = 3.1415926f;
        @Override
        protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
            setMeasuredDimension(CENTER_X * 2, CENTER_Y * 2);
        }
        @Override
        protected void onDraw(Canvas canvas) {
            float r = CENTER_X - mPaint.getStrokeWidth() * 0.5f;
            canvas.translate(CENTER_X, CENTER_Y);
            canvas.drawOval(new RectF(-r, -r, r, r), mPaint);
            canvas.drawCircle(0, 0, CENTER_RADIUS, mCenterPaint);
            if (mTrackingCenter) {
                int c = mCenterPaint.getColor();
                mCenterPaint.setStyle(Paint.Style.STROKE);
                if (mHighlightCenter) {
                    mCenterPaint.setAlpha(0xFF);
                } else {
                    mCenterPaint.setAlpha(0x80);
                }
                canvas.drawCircle(0, 0,
                        CENTER_RADIUS + mCenterPaint.getStrokeWidth(), mCenterPaint);
                mCenterPaint.setStyle(Paint.Style.FILL);
                mCenterPaint.setColor(c);
            }
        }
        @Override
        public boolean onTouchEvent(MotionEvent event) {
            float x = event.getX() - CENTER_X;
            float y = event.getY() - CENTER_Y;
            boolean inCenter = Math.sqrt(x*x + y*y) <= CENTER_RADIUS;
            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    mTrackingCenter = inCenter;
                    if (inCenter) {
                        mHighlightCenter = true;
                        invalidate();
                        break;
                    }
                case MotionEvent.ACTION_MOVE:
                    if (mTrackingCenter) {
                        if (mHighlightCenter != inCenter) {
                            mHighlightCenter = inCenter;
                            invalidate();
                        }
                    } else {
                        float angle = (float) Math.atan2(y, x);
                        float unit = angle / (2 * PI);
                        if (unit < 0) {
                            unit += 1;
                        }
                        mCenterPaint.setColor(interpColor(mColors, unit));
                        invalidate();
                    }
                    break;
                case MotionEvent.ACTION_UP:
                    if (mTrackingCenter) {
                        if (inCenter) {
                            mListener.colorChanged(mCenterPaint.getColor());
                        }
                        mTrackingCenter = false;
                        invalidate();
                    }
                    break;
            }
            return true;
        }
        private int floatToByte(float x) {
            int n = Math.round(x);
            return n;
        }
        private int pinToByte(int n) {
            if (n < 0) {
                n = 0;
            } else if (n > 255) {
                n = 255;
            }
            return n;
        }
        private int ave(int s, int d, float p) {
            return s + Math.round(p * (d - s));
        }
        private int interpColor(int colors[], float unit) {
            if (unit <= 0) {
                return colors[0];
            }
            if (unit >= 1) {
                return colors[colors.length - 1];
            }
            float p = unit * (colors.length - 1);
            int i = (int) p;
            p -= i;
            int c0 = colors[i];
            int c1 = colors[i+1];
            int a = ave(Color.alpha(c0), Color.alpha(c1), p);
            int r = ave(Color.red(c0), Color.red(c1), p);
            int g = ave(Color.green(c0), Color.green(c1), p);
            int b = ave(Color.blue(c0), Color.blue(c1), p);
            return Color.argb(a, r, g, b);
        }
        private int rotateColor(int color, float rad) {
            float deg = rad * 180 / 3.1415927f;
            int r = Color.red(color);
            int g = Color.green(color);
            int b = Color.blue(color);
            ColorMatrix cm = new ColorMatrix();
            ColorMatrix tmp = new ColorMatrix();
            cm.setRGB2YUV();
            tmp.setRotate(0, deg);
            cm.postConcat(tmp);
            tmp.setYUV2RGB();
            cm.postConcat(tmp);
            final float[] a = cm.getArray();
            int ir = floatToByte(a[0] * r + a[1] * g + a[2] * b);
            int ig = floatToByte(a[5] * r + a[6] * g + a[7] * b);
            int ib = floatToByte(a[10] * r + a[11] * g + a[12] * b);
            return Color.argb(Color.alpha(color), pinToByte(ir), pinToByte(ig), pinToByte(ib));
        }
    }
}