Android Launcher3桌面图标样式修改(添加圆角)

1.源码类:LauncherActivityCachingLogic.java

java 复制代码
/*
 * Copyright (C) 2018 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.android.launcher3.icons;

import android.content.ComponentName;
import android.content.Context;
import android.content.pm.LauncherActivityInfo;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PaintFlagsDrawFilter;
import android.graphics.RectF;
import android.graphics.Shader;
import android.os.UserHandle;
import android.util.Log;

import com.android.launcher3.IconProvider;
import com.android.launcher3.R;
import com.android.launcher3.icons.cache.CachingLogic;
import com.android.launcher3.util.ResourceBasedOverride;

/**
 * Caching logic for LauncherActivityInfo.
 */
public class LauncherActivityCachingLogic
        implements CachingLogic<LauncherActivityInfo>, ResourceBasedOverride {

    /**
     * Creates and returns a new instance
     */
    public static LauncherActivityCachingLogic newInstance(Context context) {
        return Overrides.getObject(LauncherActivityCachingLogic.class, context,
                R.string.launcher_activity_logic_class);
    }

    @Override
    public ComponentName getComponent(LauncherActivityInfo object) {
        return object.getComponentName();
    }

    @Override
    public UserHandle getUser(LauncherActivityInfo object) {
        return object.getUser();
    }

    @Override
    public CharSequence getLabel(LauncherActivityInfo object) {
        return object.getLabel();
    }

    @Override
    public void loadIcon(Context context, LauncherActivityInfo object,
            BitmapInfo target) {
        LauncherIcons li = LauncherIcons.obtain(context);
        li.createBadgedIconBitmap(
                IconProvider.INSTANCE.get(context)
                        .getIcon(object, li.mFillResIconDpi, true /* flattenDrawable */),
                object.getUser(), object.getApplicationInfo().targetSdkVersion).applyTo(target);
        li.recycle();
        
        //这里添加即可
        target.icon=roundBitmap(target.icon,150,150,30);
    }

    /**
     * 添加圆角白色背景
     * @param bitmap
     * @param outWidth
     * @param outHeight
     * @param mRadius
     * @return
     */
    public Bitmap roundBitmap(Bitmap bitmap, int outWidth, int outHeight, float mRadius) {
        if (bitmap == null || bitmap.getWidth() <= 0 || bitmap.getHeight() <= 0) return null;

        //添加白色背景
        Bitmap newBp = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888);
        Canvas bpCs = new Canvas(newBp);
        bpCs.setDrawFilter(new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG));
        bpCs.drawColor(Color.WHITE);
        bpCs.drawBitmap(bitmap, 0, 0, null);
        bitmap = newBp;

        // 缩放设置
        float widthScale = outWidth * 1.0f / bitmap.getWidth();
        float heightScale = outHeight * 1.0f / bitmap.getHeight();
        Matrix matrix = new Matrix();
        matrix.setScale(widthScale, heightScale);

        BitmapShader bitmapShader = new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
        bitmapShader.setLocalMatrix(matrix);

        // 结果图
        Bitmap targetBitmap = Bitmap.createBitmap(outWidth, outHeight, Bitmap.Config.ARGB_8888);

        // 创建画笔
        Paint paint = new Paint();
        paint.setAntiAlias(true);
        paint.setShader(bitmapShader);

        // 创建目标画布
        Canvas targetCanvas = new Canvas(targetBitmap);
        targetCanvas.setDrawFilter(new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG));

        targetCanvas.drawRoundRect(new RectF(0, 0, outWidth, outHeight), mRadius, mRadius, paint);

        return targetBitmap;
    }

}
相关推荐
爱学习的大牛1235 小时前
使用C++开发Android .so库的优势与实践指南
android·.so·1024程序员节
帅锅锅0077 小时前
SeLinux Type(类型)深度解析
android·操作系统
2501_915921438 小时前
iOS混淆与IPA加固全流程(iOS混淆 IPA加固 Ipa Guard实战)
android·ios·小程序·https·uni-app·iphone·webview
游戏开发爱好者88 小时前
iOS 26 App 开发阶段性能优化 从多工具协作到数据驱动的实战体系
android·ios·小程序·uni-app·iphone·webview·1024程序员节
2501_915106328 小时前
深入剖析 iOS 26 系统流畅度,多工具协同监控与性能优化实践
android·ios·性能优化·小程序·uni-app·cocoa·iphone
小彤花园8 小时前
GooglePlay更改签名秘钥报错(2025最新版)
android·google
Answer_momo9 小时前
一文读懂 Kotlin 数据流 Flow 的使用
android
雨白9 小时前
Kotlin Flow 入门:构建响应式异步数据流
android·kotlin
阿里云云原生10 小时前
告别手动埋点!Android 无侵入式数据采集方案深度解析
android·云原生