Android图片的交集或补集

最新推荐文章于 2024-07-08 03:10:32 发布

原创最新推荐文章于 2024-07-08 03:10:32 发布 · 917 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#Android

本文介绍了一种在Android应用中实现电量指示器的方法。通过使用Bitmap和Canvas等绘图组件，结合PorterDuffXfermode实现透明度渐变效果，以直观显示设备电量水平。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

package com.example.animotiontest;

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PaintFlagsDrawFilter;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.widget.ImageView;

public class MainActivity extends Activity {
Bitmap outBitmap;

public Bitmap getProgressBtimap(Context context, Bitmap sourceBitmap,
int battery) {
recycleBitmap(outBitmap);
float x = sourceBitmap.getWidth();
float y = sourceBitmap.getHeight();
outBitmap = Bitmap.createBitmap(sourceBitmap.getWidth(),
sourceBitmap.getHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(outBitmap);
float translate_height = (float) (battery * 1.0 / 100) * sourceBitmap.getHeight();
final Paint paint = new Paint();
final int color = 0xff038D94;
final Rect ovalRect = new Rect(0, 0, sourceBitmap.getWidth(),
sourceBitmap.getHeight());
canvas.drawColor(0x00000000);

PaintFlagsDrawFilter pfd = new PaintFlagsDrawFilter(0,
Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG);
canvas.setDrawFilter(pfd);
paint.setAntiAlias(true);
paint.setStyle(Paint.Style.FILL);
paint.setColor(color);
canvas.drawCircle(x/2, y/2, x/2-4, paint);
canvas.translate(0, sourceBitmap.getHeight() - translate_height);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(sourceBitmap, ovalRect, ovalRect, paint);
return outBitmap;
}
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ImageView iv_reminder =(ImageView) findViewById(R.id.widget_battery_remainder_iv);
Drawable drawable = getResources().getDrawable(R.drawable.power_bg_progress_13);
BitmapDrawable bd = (BitmapDrawable)drawable;
Bitmap bitmap = getProgressBtimap(this,bd.getBitmap(),50);
if(bitmap!=null&&!bitmap.isRecycled()){
iv_reminder.setImageBitmap(bitmap);
}
}
void recycleBitmap(Bitmap bitmap) {
if (bitmap != null && !bitmap.isRecycled()) {
bitmap.recycle();
}
}
}