本文所涉及的都方法需要依赖系统源码，内置系统应用，仅此记录一下

一、修改字体大小：

private float[] mFontValues = {0.85f, 1.0f, 1.15f, 1.30f};

final ContentResolver resolver = getContentResolver();
Settings.System.putFloat(resolver, Settings.System.FONT_SCALE, mFontValues[progress]);

二、修改显示大小：

import android.view.Display;
import com.android.settingslib.display.DisplayDensityUtils;
    
private void doInitDpi() {

        final DisplayDensityUtils density = new DisplayDensityUtils(getApplicationContext());

        final int initialIndex = density.getCurrentIndex();
        if (initialIndex < 0) {
            final int densityDpi = getResources().getDisplayMetrics().densityDpi;
            mValues = new int[]{densityDpi};
            mDefaultDensity = densityDpi;
        } else {
            mValues = density.getValues();
            mDefaultDensity = density.getDefaultDensity();
        }

        for (int i = 0; i < mValues.length; i++) {
            Log.d(TAG, "doInitDpi: mValues[" + i + "] = " + mValues[i]);
        }

        Log.d(TAG, "doInitDpi: mDefaultDensity =  " + mDefaultDensity);
        
    }


DisplayDensityUtils.setForcedDisplayDensity(Display.DEFAULT_DISPLAY, densityDpi);

三、修改默认dpi

    private void doCustomDpi(int inputDpi) {
        final Resources res = getResources();
        final DisplayMetrics metrics = res.getDisplayMetrics();
        getWindowManager().getDefaultDisplay().getRealMetrics(metrics);
        final int newSwDp = Math.max(inputDpi, 320);
        final int minDimensionPx = Math.min(metrics.widthPixels, metrics.heightPixels);
        final int newDensity = DisplayMetrics.DENSITY_MEDIUM * minDimensionPx / newSwDp;
        final int densityDpi = Math.max(newDensity, 120);

        Log.d(TAG, "doCustomDpi: inputDpi = " + inputDpi + ", newSwDp = " + +newSwDp + ", minDimensionPx = " + minDimensionPx
                + ", newDensity = " + newDensity + ",  densityDpi = " + densityDpi);
        DisplayDensityUtils.setForcedDisplayDensity(Display.DEFAULT_DISPLAY, densityDpi);
    }

源码地址：https://download.csdn.net/download/hj_key/12532653

 

转载请标明出处：https://blog.csdn.net/hj_key/article/details/106836256