Android通过代码批量生成字符图标用于给输入法显示状态栏的图标

关键Java代码

import android.app.Activity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.TextView;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Locale;
import android.widget.LinearLayout;
import android.text.TextUtils;

public class IconGeneratorActivity extends Activity {
    private static final String TAG = "IconGeneratorActivity";
    private LinearLayout parentLayout;
    @Override
    public void onCreate(Bundle savedInstance) {
        super.onCreate(savedInstance);
        setContentView(R.layout.activity_icon);
        parentLayout = findViewById(R.id.parentLayout);
        String[] localeNames = getAssets().getLocales();
        Arrays.sort(localeNames);
        ArrayList<Locale> locales = new ArrayList<Locale>();
        for (String ln : localeNames) {
            int u = ln.indexOf('-');
            if (u >= 0) {
                Log.e(TAG, "locale = " + ln);
                locales.add(new Locale(ln.substring(0, u), ln.substring(u+1)));
            }
        }
        final String[] modes = new String[] {"abc", "Abc", "ABC"};
        for (final String localeName : localeNames) {
            if (!TextUtils.isEmpty(localeName)) {
                for (final String mode : modes) {
                    String textLocale = localeName;
                    if (modes[0].equals(mode)) {
                    } else if (modes[1].equals(mode)) {
                        textLocale = textLocale.substring(0,1).toUpperCase() + textLocale.substring(1);
                    } else if (modes[2].equals(mode)) {
                        textLocale = textLocale.toUpperCase();
                    }
                    final TextView tv_locale = new TextView(this);
                    parentLayout.addView(tv_locale, -2, -2);
                    tv_locale.setText(textLocale);
                    tv_locale.setDrawingCacheEnabled(true);
                    tv_locale.setDrawingCacheQuality(View.DRAWING_CACHE_QUALITY_HIGH);
                    tv_locale.setPadding(0, 0, 0, 0);
                    tv_locale.setTextColor(android.graphics.Color.parseColor("#ffffff"));
                    tv_locale.setTextSize(20);
                    tv_locale.setIncludeFontPadding(false);
                    tv_locale.postDelayed(new Runnable(){
                        public void run() {
                            if (tv_locale != null && tv_locale.getDrawingCache() != null) {
                                int modeNum = 0;
                                if (modes[0].equals(mode)) {
                                    modeNum = 0;
                                } else if (modes[1].equals(mode)) {
                                    modeNum = 1;
                                } else if (modes[2].equals(mode)) {
                                    modeNum = 2;
                                }
                                saveBitmap(tv_locale.getDrawingCache().copy(Bitmap.Config.ARGB_8888, false), "ic_locale_"+localeName.replaceAll("-","_").toLowerCase()+"_" + modeNum + ".png");
                            }
                        }
                    }, 300);
                }
            }
        }
    }

    private void saveBitmap(Bitmap b, String filename) {
        try {
            File pngFolder = new File("/sdcard/pngs/");
            if (!pngFolder.exists()) {
                pngFolder.mkdirs();
            } 
            FileOutputStream fos = new FileOutputStream(new File("/sdcard/pngs/" + filename));
            b.compress(Bitmap.CompressFormat.PNG, 100, fos);
            fos.close();
        } catch (IOException e) {
            Log.i(TAG, "failed to write PNG", e);
        }
    }
}

给 TextView 加边框

<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <solid android:color="#00000000"/>
    <stroke android:width="2dip" android:color="#ff000000" />
</shape>

运行了之后把 /sdcard/pngs/ 下的图片全都pull出来就可以使用了，此方法可以自己生成一些简单的图片，不再需要找UI做图