短视频源码,每日任务通过刮卡的方式选择,刮卡动画实现的相关代码
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:background="@drawable/bk"
tools:context=".MainActivity">
<ImageView
android:id="@+id/bg"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/bg"/>
<ImageView
android:id="@+id/imgv"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop"
android:src="@drawable/scratch_card"/>
</RelativeLayout>
MainActivity.java
package com.example.service;
import androidx.appcompat.app.AppCompatActivity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.text.Html;
import android.util.DisplayMetrics;
import android.view.Display;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.CalendarView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.ImageView;
import android.os.Bundle;
public class MainActivity extends AppCompatActivity {
private ImageView imageView;
private Bitmap alterBitmap;
private double nX,nY;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageView=(ImageView) findViewById(R.id.imgv);
Bitmap bitmap= BitmapFactory.decodeResource(getResources(),R.drawable.scratch_card);
alterBitmap=Bitmap.createBitmap(bitmap.getWidth(),bitmap.getHeight(),bitmap.getConfig());
DisplayMetrics dm=new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
nX=(double) bitmap.getWidth()/dm.widthPixels;
nY=(double) bitmap.getHeight()/dm.heightPixels;
Canvas canvas=new Canvas(alterBitmap);
Paint paint=new Paint();
paint.setColor(Color.BLACK);
paint.setAntiAlias(true);
Matrix matrix=new Matrix();
canvas.drawBitmap(bitmap,matrix,paint);
imageView.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
try{
int x=(int) event.getX();
int y=(int) event.getY();
for(int i=-100;i<100;i++){
for(int j=-100;i<100;i++){
if(Math.sqrt((i*i)+(j*j))<=100){
alterBitmap.setPixel((int)(x*nX)+i,(int)(y*nY+90)+j,Color.TRANSPARENT);
}
}
}
imageView.setImageBitmap(alterBitmap);
}catch (Exception e){
e.printStackTrace();
}
return true;
}
});
}
}
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