Android 照片涂鸦4-5

最新推荐文章于 2024-06-08 09:30:56 发布

原创最新推荐文章于 2024-06-08 09:30:56 发布 · 379 阅读

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本文详细介绍了如何使用Android平台创建一个手写识别应用，包括设计布局文件、主控文件及手写识别核心代码。通过LinearLayout布局实现界面元素的垂直和水平排列，利用自定义View组件捕捉并处理用户的手写输入，同时提供了清屏功能。

设计布局文件

activiy_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical">
    <com.example.ex_4_5.HandWrite
        android:id="@+id/handwriteview"
        android:layout_height="380dp"
        android:layout_width="380dp"
        tools:ignore="MissingConstraints" />
    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="horizontal"
        android:gravity="center_horizontal">
        <Button
            android:layout_width="200dp"
            android:layout_height="wrap_content"
            android:id="@+id/clear"
            android:text="清屏"/>
    </LinearLayout>
</LinearLayout>

设计主控文件MainActivity.java

package com.example.ex_4_5;
import android.app.Activity;
import android.view.View.OnClickListener;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

   private HandWrite handWrite = null;
   private Button clear = null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        handWrite = (HandWrite) findViewById(R.id.handwriteview);
        clear = (Button) findViewById(R.id.clear);
        clear.setOnClickListener(new mClick());
    }

     private class mClick implements OnClickListener {

        @Override
        public void onClick(View v) {
            handWrite.clear();
        }
    }
}

记录滑动痕迹HandWrite.java

package com.example.ex_4_5;

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.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;

public class HandWrite extends View {
    Paint paint = null;
    Bitmap originalBitmap = null;
    Bitmap new1_Bitmap = null;
    Bitmap new2_Bitmap = null;
    float startX = 0, startY = 0;
    float clickX = 0, clickY = 0;
    boolean isMove = true;
    boolean isClear = false;
    int color = Color.GREEN;
    float strokeWidth = 2.0f;

    public HandWrite(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        originalBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.cy).copy(Bitmap.Config.ARGB_8888, true);
        new1_Bitmap = Bitmap.createBitmap(originalBitmap);
    }

    public void clear() {
        isClear = true;
        new2_Bitmap = Bitmap.createBitmap(originalBitmap);
        invalidate();
    }

    public void setstyle(float strokeWidth) {
        this.strokeWidth = strokeWidth;
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        canvas.drawBitmap(HandWriting(new1_Bitmap), 0, 0, null);
    }

    public Bitmap HandWriting(Bitmap o_bitmap) {
        Canvas canvas = null;
        if (isClear) {
            canvas = new Canvas(new2_Bitmap);
        } else {
            canvas = new Canvas(o_bitmap);
        }
        paint = new Paint();
        paint.setStyle(Paint.Style.STROKE);
        paint.setAntiAlias(true);
        paint.setColor(color);
        paint.setStrokeWidth(strokeWidth);
        if (isMove) {
            canvas.drawLine(startX, startY, clickX, clickY, paint);
        }
        startX = clickX;
        startY = clickY;
        if (isClear) {
            return new2_Bitmap;
        }
        return o_bitmap;
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        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);
    }

}

运行结果