VectorDrawableToPng.java

package com.example.myapplication;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.util.Log;

import androidx.core.content.ContextCompat;

import java.io.File;
import java.io.FileOutputStream;

public class VectorDrawableToPng {

    // adb -s emulator-5554 shell wm density 420

    public static void convert(final Context ctx) {
        new Thread(new Runnable() {
            @Override
            public void run() {
                int[] res = new int[]{
                        R.drawable.a,
                        R.drawable.b,
                        R.drawable.c
                };

                String root = "/sdcard/res/";
                new File(root + "drawable/").delete();
                new File(root + "drawable/").mkdirs();
                new File(root + "drawable-hdpi/").delete();
                new File(root + "drawable-hdpi/").mkdirs();
                new File(root + "drawable-xhdpi/").delete();
                new File(root + "drawable-xhdpi/").mkdirs();
                new File(root + "drawable-xxhdpi/").delete();
                new File(root + "drawable-xxhdpi/").mkdirs();
                new File(root + "drawable-xxxhdpi/").delete();
                new File(root + "drawable-xxxhdpi/").mkdirs();

                for (int i : res) {
                    exportDrawable(ctx, i);
                }
            }
        }).start();
    }

    public static void exportDrawable(Context ctx, int id) {
        Drawable d = ContextCompat.getDrawable(ctx, id);
        int w = d.getIntrinsicWidth();
        int h = d.getIntrinsicHeight();
        float ratio = (float) w / h;

        String root = "/sdcard/res/";
        String name = ctx.getResources().getResourceEntryName(id);
        int sW, sH;

        Log.e("quang", "exportDrawable: " + name + " " + w + "x" + h);

        int min = 36;
        try {
            // drawable + hdpi: 36
            if (w < h) {
                sW = min;
                sH = (int) (sW / ratio);
            } else {
                sH = min;
                sW = (int) (sH * ratio);
            }
            Bitmap b = Bitmap.createBitmap(sW, sH, Bitmap.Config.ARGB_8888);
            d.setBounds(0, 0, sW, sH);
            d.draw(new Canvas(b));
            b.compress(Bitmap.CompressFormat.PNG, 100, new FileOutputStream(root + "drawable/" + name + ".png"));
            b.compress(Bitmap.CompressFormat.PNG, 100, new FileOutputStream(root + "drawable-hdpi/" + name + ".png"));

            // xhdpi: 48
            if (w < h) {
                sW = (int) (min / 0.75);
                sH = (int) (sW / ratio);
            } else {
                sH = (int) (min / 0.75);
                sW = (int) (sH * ratio);
            }
            b = Bitmap.createBitmap(sW, sH, Bitmap.Config.ARGB_8888);
            d.setBounds(0, 0, sW, sH);
            d.draw(new Canvas(b));
            b.compress(Bitmap.CompressFormat.PNG, 100, new FileOutputStream(root + "drawable-xhdpi/" + name + ".png"));

            // xxhdpi: 72
            if (w < h) {
                sW = min * 2;
                sH = (int) (sW / ratio);
            } else {
                sH = min * 2;
                sW = (int) (sH * ratio);
            }
            b = Bitmap.createBitmap(sW, sH, Bitmap.Config.ARGB_8888);
            d.setBounds(0, 0, sW, sH);
            d.draw(new Canvas(b));
            b.compress(Bitmap.CompressFormat.PNG, 100, new FileOutputStream(root + "drawable-xxhdpi/" + name + ".png"));

            // xxxhdpi: 96
            if (w < h) {
                sW = (int) (min / 0.375);
                sH = (int) (sW / ratio);
            } else {
                sH = (int) (min / 0.375);
                sW = (int) (sH * ratio);
            }
            b = Bitmap.createBitmap(sW, sH, Bitmap.Config.ARGB_8888);
            d.setBounds(0, 0, sW, sH);
            d.draw(new Canvas(b));
            b.compress(Bitmap.CompressFormat.PNG, 100, new FileOutputStream(root + "drawable-xxxhdpi/" + name + ".png"));
        } catch (Throwable t) {
            t.printStackTrace();
        }
    }

}