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Android studio实现画板功能,kotlin声明数组

妖妖妈 2022-02-03 阅读 60

Log.i(“MyPaintToolsActivity”,imageview.getWidth()+" "+imageview.getHeight());

Point point = new Point();

getWindowManager().getDefaultDisplay().getSize(point);

Log.i(“MyPaintToolsActivity”,point.x+" "+point.y);

bitmap = Bitmap.createBitmap(888,1200,Bitmap.Config.ARGB_8888);

canvas = new Canvas(bitmap);

canvas.drawColor(Color.argb(100,0,0,0));

paint = new Paint();

paint.setStrokeWidth(5);

paint.setAntiAlias(true);

paint.setColor(Color.RED);

canvas.drawBitmap(bitmap,new Matrix(),paint);

imageview.setImageBitmap(bitmap);

注册触摸监听事件,获取鼠标按下时的坐标和鼠标移动后的坐标。在开始和结束之间画一条直线并更新画布图片

imageview.setOnTouchListener(new View.OnTouchListener() {

@Override

public boolean onTouch(View v, MotionEvent event) {

switch(event.getAction()){

case MotionEvent.ACTION_DOWN:

Log.i(“MyPaintToolsActivity”,“ACTION_DOWN”);

startX = (int) (event.getX()/1.4);

startY = (int) (event.getY()/1.4);

break;

case MotionEvent.ACTION_MOVE:

Log.i(“MyPaintToolsActivity”,“ACTION_MOVE”);

endX = (int) (event.getX()/1.4);

endY = (int) (event.getY()/1.4);

canvas.drawLine(startX,startY,endX,endY,paint);

startX = (int) (event.getX()/1.4);

startY = (int) (event.getY()/1.4);

imageview.setImageBitmap(bitmap);

break;

case MotionEvent.ACTION_UP:

Log.i(“MyPaintToolsActivity”,“ACTION_UP”);

break;

}

imageview.invalidate();

return true;

}

});

清屏的话就一行代码 ,剩下的是重新生成一块画布

Button btn_clear = findViewById(R.id.btn_clear);

btn_clear.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

canvas.drawColor(0,PorterDuff.Mode.CLEAR);

bitmap = Bitmap.createBitmap(888,1200,Bitmap.Config.ARGB_8888);

canvas = new Canvas(bitmap);

canvas.drawColor(Color.argb(100,0,0,0));

paint = new Paint();

paint.setStrokeWidth(5);

paint.setAntiAlias(true);

paint.setColor(Color.RED);

canvas.drawBitmap(bitmap,new Matrix(),paint);

imageview.setImageBitmap(bitmap);

}

});

呃,这里会把画布擦掉…也就是擦成白色…

// 擦除

Button btn_eraser = findViewById(R.id.btn_eraser);

btn_eraser.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

paint.setColor(Color.rgb(250,250,250));

paint.setStrokeWidth(30);

}

});

}

}

最后看看页面布局

<?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=“match_parent”

android:layout_height=“match_parent”

android:orientation=“vertical”

android:id="@+id/ll_layout">

<ImageView

android:id="@+id/imageview"

android:layout_width=“match_parent”

android:layout_height=“match_parent”

android:layout_weight=“1” />

<RadioGroup

android:background="#747373"

android:layout_width=“match_parent”

android:orientation=“horizontal”

android:id="@+id/rg_color"

android:layout_height=“wrap_content”>

<RadioButton

android:id="@+id/rb_red"

android:layout_width=“wrap_content”

android:layout_height=“43dp”

android:layout_weight=“1”

android:text=“红色”

android:textColor="#FF0000"

android:textSize=“18sp” />

<RadioButton

android:id="@+id/rb_green"

android:layout_width=“wrap_content”

android:layout_height=“30dp”

android:layout_weight=“1”

android:text=“黑色”

android:textColor="#000000"

android:textSize=“18sp” />

<RadioButton

android:id="@+id/rb_blue"

资源分享

  • 最新大厂面试专题

这个题库内容是比较多的,除了一些流行的热门技术面试题,如Kotlin,数据库,Java虚拟机面试题,数组,Framework ,混合跨平台开发,等

  • 对应导图的Android高级工程师进阶系统学习视频
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droid:id="@+id/rb_blue"

资源分享

  • 最新大厂面试专题

这个题库内容是比较多的,除了一些流行的热门技术面试题,如Kotlin,数据库,Java虚拟机面试题,数组,Framework ,混合跨平台开发,等

[外链图片转存中…(img-5JEhaWbm-1643868385771)]

  • 对应导图的Android高级工程师进阶系统学习视频
    最近热门的,NDK,热修复,MVVM,源码等一系列系统学习视频都有!

[外链图片转存中…(img-t6tFe9vC-1643868385772)]

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