手写输入和软键盘输入

今天项目需要完成一个支持手写和键盘都可以输入的功能，点击键盘切换到软键盘输入，此时按钮会变成手写，在点击就回到手写。按钮是checkbox。功能很简单。

   支持手写和键盘输入,其实并不难，就是布局麻烦点，还有就是画布麻烦点（我是网上找现成的），其他的都很简单。我注释写的很清楚就直接贴代码了。


 1.画布代码。

package example.caobin.com.myhandwrite;

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Path;
import android.graphics.PorterDuff;
import android.support.annotation.ColorInt;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;


/**
 * 绘制Path的View 用于手写签名
 */
@SuppressLint("ClickableViewAccessibility")
public class LinePathView extends View {

    private  static final String TAG=LinePathView.class.getSimpleName();

    private Context mContext;

    /**
     * 笔画X坐标起点
     */
    private float mX;
    /**
     * 笔画Y坐标起点
     */
    private float mY;
    /**
     * 手写画笔
     */
    private final Paint mGesturePaint = new Paint();
    /**
     * 路径
     */
    private final Path mPath = new Path();
    /**
     * 背景画布
     */
    private Canvas cacheCanvas;
    /**
     * 背景Bitmap缓存
     */
    private Bitmap cachebBitmap;
    /**
     * 是否已经签名
     */
    private boolean isTouched = false;


    /**
     * 画笔宽度 px；
     */
    private int mPaintWidth = 10;

    /**
     * 前景色
     */
    private int mPenColor = Color.BLACK;

    private int mBackColor= Color.TRANSPARENT;
    public LinePathView(Context context) {
        super(context);
        init(context);
    }

    public LinePathView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(context);
    }

    public LinePathView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init(context);
    }

    public void init(Context context) {
        this.mContext = context;
        mGesturePaint.setAntiAlias(true);
        mGesturePaint.setStyle(Style.STROKE);
        mGesturePaint.setStrokeWidth(mPaintWidth);
        mGesturePaint.setColor(mPenColor);

    }


    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        cachebBitmap = Bitmap.createBitmap(getWidth(), getHeight(), Config.ARGB_8888);
        cacheCanvas = new Canvas(cachebBitmap);
        cacheCanvas.drawColor(mBackColor);
        isTouched=false;
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                touchDown(event);
                break;
            case MotionEvent.ACTION_MOVE:
                isTouched = true;
                touchMove(event);
                break;
            case MotionEvent.ACTION_UP:
                cacheCanvas.drawPath(mPath, mGesturePaint);
                mPath.reset();
                break;
        }
        // 更新绘制
        invalidate();
        return true;
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        canvas.drawBitmap(cachebBitmap, 0, 0, mGesturePaint);
        // 通过画布绘制多点形成的图形
        canvas.drawPath(mPath, mGesturePaint);
    }

    // 手指点下屏幕时调用
    private void touchDown(MotionEvent event) {

        // mPath.rewind();
        // 重置绘制路线，即隐藏之前绘制的轨迹
        mPath.reset();
        float x = event.getX();
        float y = event.getY();

        mX = x;
        mY = y;
        // mPath绘制的绘制起点
        mPath.moveTo(x, y);
    }

    // 手指在屏幕上滑动时调用
    private void touchMove(MotionEvent event) {
        final float x = event.getX();
        final float y = event.getY();

        final float previousX = mX;
        final float previousY = mY;

        final float dx = Math.abs(x - previousX);
        final float dy = Math.abs(y - previousY);

        // 两点之间的距离大于等于3时，生成贝塞尔绘制曲线
        if (dx >= 3 || dy >= 3) {
            // 设置贝塞尔曲线的操作点为起点和终点的一半
            float cX = (x + previousX) / 2;
            float cY = (y + previousY) / 2;

            // 二次贝塞尔，实现平滑曲线；previousX, previousY为操作点，cX, cY为终点
            mPath.quadTo(previousX, previousY, cX, cY);

            // 第二次执行时，第一次结束调用的坐标值将作为第二次调用的初始坐标值
            mX = x;
            mY = y;
        }
    }

    /**
     * 清除画板
     */
    public void clear() {
        if (cacheCanvas != null) {
            isTouched = false;
            mGesturePaint.setColor(mPenColor);
            cacheCanvas.drawColor(mBackColor, PorterDuff.Mode.CLEAR);
            mGesturePaint.setColor(mPenColor);
            invalidate();
        }
    }


    /**
     * 保存画板
     *
     * @param path 保存到路劲
     */

    public void save(String path) throws IOException {
        save(path, false, 0);
    }

    /**
     * 保存画板
     *
     * @param path       保存到路劲
     * @param clearBlank 是否清楚空白区域
     * @param blank  边缘空白区域
     */
    public void save(String path, boolean clearBlank, int blank) throws IOException {

        Bitmap bitmap=cachebBitmap;
        //BitmapUtil.createScaledBitmapByHeight(srcBitmap, 300);//  压缩图片
        if (clearBlank) {
            bitmap = clearBlank(bitmap, blank);
        }
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.PNG, 100, bos);
        byte[] buffer = bos.toByteArray();
        if (buffer != null) {
                File file = new File(path);
                if (file.exists()) {
                    file.delete();
                }
                OutputStream outputStream = new FileOutputStream(file);
                outputStream.write(buffer);
                outputStream.close();
        }
    }

    /**
     * 获取画板的bitmap
     * @return
     */
    public Bitmap getBitMap()
    {
        setDrawingCacheEnabled(true);
        buildDrawingCache();
        Bitmap bitmap=getDrawingCache();
        setDrawingCacheEnabled(false);
        return bitmap;
    }




    /**
     * 逐行扫描 清楚边界空白。
     *
     * @param bp
     * @param blank 边距留多少个像素
     * @return
     */
    private Bitmap clearBlank(Bitmap bp, int blank) {
        int HEIGHT = bp.getHeight();
        int WIDTH = bp.getWidth();
        int top = 0, left = 0, right = 0, bottom = 0;
        int[] pixs = new int[WIDTH];
        boolean isStop;
        for (int y = 0; y < HEIGHT; y++) {
            bp.getPixels(pixs, 0, WIDTH, 0, y, WIDTH, 1);
            isStop = false;
            for (int pix : pixs) {
                if (pix != mBackColor) {
                    top = y;
                    isStop = true;
                    break;
                }
            }
            if (isStop) {
                break;
            }
        }
        for (int y = HEIGHT - 1; y >= 0; y--) {
            bp.getPixels(pixs, 0, WIDTH, 0, y, WIDTH, 1);
            isStop = false;
            for (int pix : pixs) {
                if (pix != mBackColor) {
                    bottom = y;
                    isStop = true;
                    break;
                }
            }
            if (isStop) {
                break;
            }
        }
        pixs = new int[HEIGHT];
        for (int x = 0; x < WIDTH; x++) {
            bp.getPixels(pixs, 0, 1, x, 0, 1, HEIGHT);
            isStop = false;
            for (int pix : pixs) {
                if (pix != mBackColor) {
                    left = x;
                    isStop = true;
                    break;
                }
            }
            if (isStop) {
                break;
            }
        }
        for (int x = WIDTH - 1; x > 0; x--) {
            bp.getPixels(pixs, 0, 1, x, 0, 1, HEIGHT);
            isStop = false;
            for (int pix : pixs) {
                if (pix != mBackColor) {
                    right = x;
                    isStop = true;
                    break;
                }
            }
            if (isStop) {
                break;
            }
        }
        if (blank < 0) {
            blank = 0;
        }
        left = left - blank > 0 ? left - blank : 0;
        top = top - blank > 0 ? top - blank : 0;
        right = right + blank > WIDTH - 1 ? WIDTH - 1 : right + blank;
        bottom = bottom + blank > HEIGHT - 1 ? HEIGHT - 1 : bottom + blank;
        return Bitmap.createBitmap(bp, left, top, right - left, bottom - top);
    }

    /**
     * 设置画笔宽度 默认宽度为10px
     *
     * @param mPaintWidth
     */
    public void setPaintWidth(int mPaintWidth) {
        mPaintWidth = mPaintWidth > 0 ? mPaintWidth : 10;
        this.mPaintWidth = mPaintWidth;
        mGesturePaint.setStrokeWidth(mPaintWidth);

    }


    public void setBackColor(@ColorInt int backColor)
    {
        mBackColor=backColor;
    }


    /**
     * 设置画笔颜色
     *
     * @param mPenColor
     */
    public void setPenColor(int mPenColor) {
        this.mPenColor = mPenColor;
        mGesturePaint.setColor(mPenColor);
    }

    /**
     * 是否有签名
     *
     * @return
     */
    public boolean getTouched() {
        return isTouched;
    }
}

 2.布局代码

<?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:orientation="vertical">
    <!--顶部布局-->
    <RelativeLayout
        android:layout_width="wrap_content"
        android:layout_height="35dp"
        android:background="@drawable/register_list_top_bg">

        <Button
            android:id="@+id/btn_dialog_close"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_marginBottom="3dp"
            android:layout_marginLeft="8dp"
            android:layout_marginTop="3dp"
            android:background="@drawable/btn_close_selector" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:text="请签名"
            android:textColor="@color/black"
            android:textSize="17sp" />

        <Button
            android:id="@+id/btn_save"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="3dp"
            android:layout_marginRight="8dp"
            android:layout_marginTop="3dp"
            android:layout_toLeftOf="@+id/tv_empty"
            android:background="@drawable/save_note_selector" />

        <TextView
            android:id="@+id/tv_empty"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:text="" />

    </RelativeLayout>
    <!--下部布局-->
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:background="@drawable/register_bias_bg">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_margin="8dp"
            android:background="#FCFBF9"
            android:orientation="vertical">

            <FrameLayout
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="0.84">

                <ImageView
                    android:id="@+id/img_view_hand_write_hint"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center"
                    android:src="@drawable/hand_write_name_hint_bg" />

                <example.caobin.com.myhandwrite.LinePathView
                    android:id="@+id/path_view"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:visibility="visible" />

                <EditText
                    android:id="@+id/edit_keyboard_register"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:background="@null"
                    android:gravity="left|top"
                    android:imeOptions="flagNoExtractUi"
                    android:visibility="invisible" />
            </FrameLayout>

            <ImageView
                android:layout_width="match_parent"
                android:layout_height="1dp"
                android:layout_marginLeft="10dp"
                android:layout_marginRight="10dp"
                android:src="@drawable/bottom_dotted_line" />

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="0.1"
                android:gravity="center_vertical">

                <CheckBox
                    android:id="@+id/check_input_type"
                    android:layout_width="60dp"
                    android:layout_height="30dp"
                    android:layout_marginLeft="30dp"
                    android:checked="true"
                    android:button="@null"
                    android:background="@drawable/btn_keyboard_selector" />

                <Button
                    android:id="@+id/btn_clear_screen"
                    android:layout_width="60dp"
                    android:layout_height="30dp"
                    android:layout_marginLeft="10dp"
                    android:background="@drawable/btn_clear_screen_gray_bg" />

                <View
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_weight="0.65" />

                <TextView
                    android:id="@+id/tv_date"
                    android:layout_width="wrap_content"
                    android:layout_height="match_parent"
                    android:layout_marginRight="20dp"
                    android:gravity="center"
                    android:text="2016年15月15"
                    android:textColor="@color/black"
                    android:textSize="18sp" />

            </LinearLayout>
        </LinearLayout>
    </LinearLayout>
</LinearLayout>

3.mainActivity代码

package example.caobin.com.myhandwrite;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Locale;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private LinePathView mLinePathView;//手写输入
    private Button clearBtn;//清屏按钮
    private EditText keyboardInputEdit;//键盘输入
    private CheckBox inputTypeCheckBox;//切换输入方式(手写/键盘)
    private int inputType = 1;//1手写（默认） 0键盘
    private ImageView inputHintView;//输入框提示背景图片

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        initListener();
    }

    private void initView() {
        mLinePathView = (LinePathView) findViewById(R.id.path_view);
        clearBtn = (Button) findViewById(R.id.btn_clear_screen);
        keyboardInputEdit = (EditText) findViewById(R.id.edit_keyboard_register);
        inputTypeCheckBox = (CheckBox) findViewById(R.id.check_input_type);
        inputHintView = (ImageView) findViewById(R.id.img_view_hand_write_hint);
        findViewById(R.id.btn_dialog_close).setOnClickListener(this);
        findViewById(R.id.btn_save).setOnClickListener(this);
        keyboardInputEdit.setOnClickListener(this);
        clearBtn.setOnClickListener(this);
        //显示当前日期
        Calendar c = Calendar.getInstance();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日", Locale.getDefault());
        ((TextView) findViewById(R.id.tv_date)).setText(sdf.format(c.getTime()));
    }

    /**
     * 监听事件
     */
    private void initListener() {
        //判断签名框是否有签名，改变清除按钮背景和隐藏签名提示背景
        mLinePathView.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                inputHintView.setVisibility(View.INVISIBLE);
                clearBtn.setBackgroundResource(R.drawable.btn_clear_screen_selector);
                return false;
            }
        });
        //切换输入方式
        inputTypeCheckBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                cleanScreen();
                //true手写  false键盘
                if (isChecked) {
                    keyboardInputEdit.setVisibility(View.INVISIBLE);
                    mLinePathView.setVisibility(View.VISIBLE);
                    inputType = 1;
                } else {
                    keyboardInputEdit.setVisibility(View.VISIBLE);
                    mLinePathView.setVisibility(View.INVISIBLE);
                    inputType = 0;
                }
            }
        });
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.btn_dialog_close: {
                //关闭
                finish();
            }
            break;
            case R.id.edit_keyboard_register: {
                //edittext点击
                inputHintView.setVisibility(View.INVISIBLE);
                clearBtn.setBackgroundResource(R.drawable.btn_clear_screen_selector);
            }
            break;
            case R.id.btn_save: {
                //保存
                save();
            }
            break;
            case R.id.btn_clear_screen: {
                //清屏
                cleanScreen();
            }
            break;
            default:
                break;
        }
    }

    /**
     * 清屏
     */
    private void cleanScreen() {
        mLinePathView.clear();
        keyboardInputEdit.setText(null);
    }


    private String name = "";//键盘输入姓名,当然你可以自定义保存的方式

    /**
     * 保存信息
     */
    private void save() {
        if (inputType == 1) {
            //手写
            if (!mLinePathView.getTouched()) {
                //没有输入就点击保存，给用户提示
                toast("请签写你的姓名！");
            } else {
                //如果已经签写内容,进行保存
                saveImage("image");
            }

        } else {
            //键盘
            if (TextUtils.isEmpty(keyboardInputEdit.getText())) {
                //没有输入就点击保存，给用户提示
                toast("请输入你的姓名!");
            } else {
                //如果已经签写内容,进行保存,保存的方式可以自定义,这里就只保存在类变量里。
                name = keyboardInputEdit.getText().toString();
                toast("保存的姓名为：" + name);
            }
        }
    }

    /**
     * 保存签字图片
     *
     * @param imageName 保存的名称
     */
    private void saveImage(String imageName) {
        //图片保存的路径. 我的手机是小米
        //图片在data/saveImagePath目录下
        String imagePath = Constants.FilePath + File.separator + imageName + ".png";
        try {
            mLinePathView.save(imagePath, false, 0);
            toast("保存成功!");
            //保存成功后清屏
            cleanScreen();
        } catch (IOException e) {
            toast("保存失败!");
        }
    }

    /**
     * Toast任何类型的数据
     *
     * @param object
     */
    private void toast(Object object) {
        Toast.makeText(this, object.toString(), Toast.LENGTH_SHORT).show();
    }
}

4.当然还有一些资源文件，太零碎了。想要的直接从github上clone吧。
我的git