实用代码块记录2

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1.dip转px

public static float dipToPx(Context context, float dpValue) {        return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dpValue,                context.getResources().getDisplayMetrics());    }

2.px 转dp

public static int px2dip(Context context, float pxValue) {        final float scale = context.getResources().getDisplayMetrics().density;        return (int) (pxValue / scale + 0.5f);    }

3.sp转px

public static float spToPx(Context context, float spValue) {        return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, spValue,                context.getResources().getDisplayMetrics());    }

4.px转sp

public static int px2sp(Context context, float pxValue) {        final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;        return (int) (pxValue / fontScale + 0.5f);    }

5.判断sd卡是否处于可以读写状态

public static boolean isSdcardReadable() {        final String state = Environment.getExternalStorageState();        if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)                || Environment.MEDIA_MOUNTED.equals(state)) {            return true;        }        return false;    }

6.判断sd卡是否处于可以写入状态

public static boolean isSdcardWritable() {        final String state = Environment.getExternalStorageState();        if (Environment.MEDIA_MOUNTED.equals(state)) {            return true;        }        return false;    }

7.Android 安装应用

    public static void installApk(Context context, File file) {        if (file.exists()) {            Intent i = new Intent(Intent.ACTION_VIEW);            i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);            i.setDataAndType(Uri.fromFile(file),                    "application/vnd.android.package-archive");            ((ContextWrapper) context).startActivity(i);        } else {            ToastUtils.showToast(context, "安装文件不存在，无法安装");        }    }

8.卸载应用

public static void uninstallApk(Context context, String pkgName) {        Uri packageURI = Uri.parse("package:" + pkgName);        Intent uninstallIntent = new Intent(Intent.ACTION_DELETE, packageURI);        uninstallIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);        context.startActivity(uninstallIntent);    }

9.拨打电话

/**     * 拨打电话 <br>     * 需要声明权限 <uses-permission     * android:name="android.permission.CALL_PHONE" />     */    public static void callMobilePhone(Activity context, String phone) {        Intent intent = new Intent(Intent.ACTION_CALL, Uri.parse(phone));        context.startActivity(intent);    }

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